Reference Tool — Not an Assessment

Developmental Trauma, PTSD, Complex PTSD & Dissociation

Reference Guide — Australian practice context, 2026. Covers diagnosis, mechanisms, differential diagnosis, behaviour translation, assessment and school response.

Important — how to use this tool.

This is an education and behaviour-practice reference, not a diagnostic tool or trauma-treatment manual. It distinguishes trauma exposure, PTSD, ICD-11 Complex PTSD, complex/developmental trauma concepts and dissociation. Developmental Trauma Disorder remains a proposed construct rather than a DSM-5-TR or ICD-11 diagnosis. Do not turn "trauma-informed" into "trauma-explains-everything" — trauma is one hypothesis among several, and behaviour still needs functional, developmental and diagnostic analysis.

Start here — key points

Term	What it actually means
Trauma exposure	An event or pattern of events that may overwhelm safety or coping. Exposure alone does not establish a disorder.
PTSD	A diagnosable post-traumatic disorder involving trauma re-experiencing/intrusion, avoidance and persistent threat/arousal, with clinically significant impairment; criteria differ somewhat between DSM-5-TR and ICD-11.
Complex PTSD	An ICD-11 diagnosis: PTSD plus persistent disturbances in emotion regulation, negative self-concept and relationships. It is not a separate DSM-5-TR diagnosis.
Complex / developmental trauma	Clinical and developmental concepts describing repeated/interpersonal adversity and broad developmental effects. They are not themselves equivalent to a formal diagnosis.
Dissociation	Disruption in the normal integration of awareness, memory, identity, perception or sense of self/world. It can occur with trauma but is not specific to trauma.

Core rule. Do not turn "trauma-informed" into "trauma-explains-everything". Trauma is one hypothesis among several, and behaviour still needs functional, developmental and diagnostic analysis.

Core symptom clusters — PTSD, CPTSD & dissociation

Secondary topics

ES tools that may help

ES tools that may help with the classroom patterns you selected. These products do not assess or treat the condition above. They provide practical classroom systems that may help with some of the behaviours, demands, communication needs or regulation patterns you are seeing. Predictable adult responses, relationship repair, and threat/escalation/regulation patterns.

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Re-experiencing & Intrusion

One of the three core PTSD symptom clusters.

Reference tool — informs practice, does not diagnose or label.

iWhat it is

Unwanted trauma memories, distressing dreams, flashbacks or intense emotional/physical reactions to reminders. In children, intrusive memory may appear as repetitive trauma-themed play, behavioural reenactment, or sudden distress the child cannot explain the link for; nightmares may not have obvious or literal trauma content.

SWhat it looks like at school

Phenomenon	What it is / is not
Intrusive memory	Unwanted memory, image, thought or sensory fragment that pushes into awareness.
Nightmare	Distressing dream; in children the theme may be general danger rather than a literal replay.
Flashback	A re-experiencing state with a sense that the event is occurring again in the present; not simply remembering something vividly.
Reenactment	Trauma themes may appear in repetitive play or behaviour, especially in younger children. Avoid interpreting every repetitive behaviour as trauma reenactment.

Reminder type	Examples
Sensory	Smell, tone of voice, footsteps, alarms, touch, lighting, clothing, a particular song or bodily sensation.
Situational	Being cornered, closed doors, adults standing over the student, police/security, medical settings, particular dates.
Relational	Perceived rejection, adult anger, sudden withdrawal, loss of control, unpredictability or conflict.
Internal	Pain, racing heart, sexual development, shame, intrusive memories or dreams.

Do not overclaim. A trigger is not proven because behaviour happened after a cue. Treat it as a hypothesis and look for repeatable patterns across occasions.

✓What helps

Reduce demand for immediate narrative ("tell me exactly what happened"); prioritise immediate safety and regulation, with factual debrief later once cognition is available.
Listen with minimal open prompts if disclosure occurs; record the student's words accurately; follow safeguarding/reporting procedures; do not promise secrecy.

Avoidance

The symptom that can look like refusal.

Reference tool — informs practice, does not diagnose or label.

iWhat it is

Avoiding memories, feelings, conversations, people, places, activities or cues connected to the trauma. In children this may present as refusing a class, route, person, activity, topic or sensation that has become associated with the event.

SWhat it looks like at school

Looks like	Could involve
Won't enter the room	Avoidance of a place associated with trauma, humiliation or threat.
Refuses to discuss an event	Avoiding trauma memories/feelings; could also reflect shame, language difficulty or privacy.
Skips a subject / route / activity	Cue-specific avoidance; or ordinary escape from difficult work — function still needs testing.
Jokes / changes subject / becomes aggressive	Behaviour may terminate emotionally threatening conversation.

✓What helps

Treat the avoided cue as a hypothesis, not a proven trigger — test function directly rather than assuming trauma.
Offer a predictable path/choice; reduce public confrontation; keep the core boundary in place.

Threat & Arousal

Hypervigilance, startle, sleep disturbance, irritability and persistent feeling that danger is present.

Reference tool — informs practice, does not diagnose or label.

iWhat it is

Hypervigilance, startle, sleep disturbance, irritability, concentration problems and persistent feeling that danger is present. DSM-5-TR additionally specifies negative changes in cognition/mood and a wider arousal/reactivity cluster.

SWhat it looks like at school

What staff may see	Possible threat-system interpretation
Watching doors, windows, peers, adults	Continuous environmental scanning may reduce cognitive capacity available for instruction.
Jumping at noise / touch	Startle response; sensory cues may be interpreted as possible danger.
Reading neutral faces as hostile	Ambiguous cues may be biased toward threat, especially when prior danger was unpredictable.
Fast defensive aggression	The response may occur before deliberate problem solving catches up. This does not make aggression harmless or consequence-free.

Mechanism	School implication
Persistent threat readiness	The student may reach defensive activation from a lower level of provocation.
Sleep disruption	Reduced inhibition, attention and frustration tolerance may amplify daytime behaviour.
Reactive aggression	Aggression follows perceived threat, frustration or humiliation. It differs conceptually from planned/proactive aggression for gain or dominance.
Recovery lag	The threat system may remain active after the objective danger has ended, so immediate reasoning/consequence discussion can fail.

✓What helps — in-the-moment escalation adjustments

Reduce	Increase
Crowding, multiple adults talking, rapid questioning, public correction, sudden touch, long explanations, threats about distant future consequences.	Space, one lead adult, short concrete language, predictable choices, visible exit/safety, time to process, neutral tone.
Demand for immediate narrative ("tell me exactly what happened").	Immediate safety and regulation; factual debrief later when cognition is available.

Affect Regulation

One of the three ICD-11 CPTSD disturbance-in-self-organisation (DSO) domains.

Reference tool — informs practice, does not diagnose or label.

iWhat it is

Persistent difficulty calming intense emotion and/or emotional numbing/shutdown. This is one of three required disturbance-in-self-organisation (DSO) domains that, together with the core PTSD syndrome, form ICD-11 Complex PTSD.

SWhat it looks like at school

Recovery lag: the threat system may remain active after the objective danger has ended, so immediate reasoning or consequence discussion can fail. A student may need to return to a usable regulatory state before any discussion of responsibility is productive.

✓What helps — repair after incidents

Step	Purpose
Return to baseline first	Do not confuse physical quiet with full cognitive recovery; allow enough time for usable attention/language.
Re-establish predictability	State what remains the same: relationship, boundary, next step, timetable.
Review briefly	Focus on observable sequence, missing skill and safer alternative rather than extracting a confession.
Repair harm	Where appropriate, make restitution achievable and concrete. Avoid forced public apologies as proof of remorse.
Update the plan	If the same sequence repeats, adult/environmental changes are needed — not just another lecture.

Negative Self-Concept

One of the three ICD-11 CPTSD disturbance-in-self-organisation (DSO) domains.

Reference tool — informs practice, does not diagnose or label.

iWhat it is

Persistent beliefs of being defeated, diminished, worthless or a failure, often with pervasive shame/guilt.

SWhat it looks like at school

Possible cognition	Behavioural consequence
"I am bad / damaged."	Defensiveness, rejecting praise, giving up, self-sabotage or aggression when failure is exposed.
"It was my fault."	Avoidance, secrecy, depression, self-punitive behaviour.
"People will reject me anyway."	Withdrawal, pre-emptive rejection, intense sensitivity to correction.
"Nothing I do changes anything."	Low persistence and future planning; may look like apathy.

✓What helps

Avoid humiliation as a teaching method — public shaming, sarcasm, intimidation and unpredictable punitive responses can increase threat without teaching replacement skills.
Separate regulation from accountability — a student may need to return to a usable state before discussing responsibility; accountability can occur after regulation.
Use consequences that connect — restitution, repair, loss of access linked to safety, re-teaching and rehearsal are more instructive than unrelated punishment.

Relationship Disturbance

One of the three ICD-11 CPTSD disturbance-in-self-organisation (DSO) domains.

Reference tool — informs practice, does not diagnose or label.

iWhat it is

Persistent difficulty sustaining relationships or feeling emotionally close to others.

SWhat it looks like at school

Adult behaviour	Why it may matter
Unpredictability / inconsistent rules	Can increase uncertainty and threat monitoring.
Public correction / humiliation	May trigger shame, defensive aggression or escape.
Sudden physical proximity	May be experienced as threat even when the adult intends support.
Calm, predictable follow-through	Reduces ambiguity without requiring emotional intimacy or permissiveness.

✓What helps

Calm, predictable follow-through — reduces ambiguity without requiring emotional intimacy or permissiveness.
Reduce sudden physical proximity, public correction and inconsistent rules where possible.

Dissociation

Disruption in the normal integration of awareness, memory, identity, perception or sense of self/world.

Reference tool — informs practice, does not diagnose or label.

iWhat it is

Domain	Examples
Awareness	Feeling detached, unreal, absent or not fully present.
Perception	The world may feel dreamlike, distant or unreal.
Sense of self	Feeling detached from one's body, thoughts or actions.
Memory	Gaps in recall that exceed ordinary forgetting in context.
Identity / continuity	In more severe dissociative conditions, discontinuity in sense of self or agency can occur.

Important. Dissociation can occur in trauma-related disorders, dissociative disorders and other contexts. It is not a synonym for freeze, shutdown, daydreaming or poor attention.

SWhat it looks like at school

Term	Typical description
Depersonalisation	Feeling detached from oneself or one's body, as if observing oneself from outside or functioning automatically.
Derealisation	The environment feels unreal, dreamlike, foggy, distant or visually altered despite reality testing being intact.
DSM-5-TR dissociative subtype	PTSD can be specified with persistent/recurrent depersonalisation and/or derealisation.

Possible observation	Interpret carefully
Gaps in recall for parts of an event	May occur with dissociation, but memory under stress is also reconstructive and imperfect.
Changing sequence/details	Does not automatically prove deception. It can reflect ordinary memory error, developmental language, suggestibility, stress or confabulation.
"I don't know" / blankness	Could be avoidance, shame, language limitations, executive problems or dissociation. Do not force a trauma explanation.

Possible explanation	Clues that may help differentiate
Dissociation	Often linked to stress/reminders; may involve unreality, memory gaps or abrupt state change.
ADHD / ordinary inattention	Occurs broadly across low-interest or sustained-attention tasks; attention can often be redirected without post-event confusion.
Autistic shutdown / overload	Often linked to sensory/social/cognitive overload; reduced speech/movement can occur without dissociative experiences.
Absence/focal seizure or other medical event	Brief stereotyped episodes, altered responsiveness or automatisms require medical consideration.

!What helps

School staff should not diagnose these presentations from observation alone. Reduce demand, orient the student gently, document duration/context, and refer concerning or persistent presentations for clinical assessment.

Basics — Trauma Exposure vs Diagnosis

Trauma, PTSD, complex PTSD and dissociation in one page; the first distinction; what counts as a potentially traumatic event.

Reference tool — informs practice, does not diagnose or label.

iTrauma, PTSD, complex PTSD and dissociation in one page

Question	Practical answer
Does trauma automatically mean PTSD?	No. Many people experience trauma without developing PTSD. Distress after trauma can be expected, transient or develop into several different disorders.
Does repeated childhood adversity automatically mean CPTSD?	No. ICD-11 CPTSD requires the core PTSD syndrome plus all three disturbance-in-self-organisation domains and functional impairment.
Is developmental trauma a diagnosis?	Not by itself. "Developmental trauma" and "complex trauma" are useful descriptive frameworks. Developmental Trauma Disorder (DTD) remains proposed, not formally recognised in DSM-5-TR or ICD-11.
Is dissociation just zoning out?	No. Zoning out is nonspecific. Dissociation can include depersonalisation, derealisation, amnesia or disruptions in awareness/identity, but clinicians must rule out attention, sleep, seizures and other explanations.
What matters most at school?	Identify the immediate function and triggers, reduce avoidable threat/shame, preserve predictable boundaries, support regulation and refer concerning trauma symptoms for clinical assessment.

iFirst distinction: trauma exposure is not a diagnosis

Level	Meaning	Common mistake
Exposure	A potentially traumatic event or repeated adversity occurred.	Calling the person "traumatised" as though a clinical syndrome is proven.
Post-traumatic reaction	Sleep change, fear, irritability, avoidance or distress may occur after an event and may settle over time.	Diagnosing PTSD immediately from any distress.
PTSD / CPTSD	Specific symptom patterns, duration and functional impairment meet diagnostic requirements.	Assuming severe behaviour equals PTSD.
Other outcomes	Depression, anxiety, grief, substance use, conduct problems, dissociation or no disorder may occur.	Forcing all post-adversity problems into one trauma explanation.

iWhat counts as a potentially traumatic event

Examples	Important qualification
Serious violence, sexual violence, serious injury, threat to life, disaster, war, severe accidents, witnessing serious harm, traumatic bereavement in qualifying circumstances.	DSM and ICD use formal exposure definitions. Not every stressful, unfair, embarrassing or unpleasant event meets PTSD trauma criteria.
Repeated maltreatment, family violence, exploitation, captivity, torture, prolonged interpersonal abuse.	These exposures are more strongly associated with complex presentations, but CPTSD criteria are based on symptoms, not merely event type.

Acute Reactions vs Persistent Disorder

What to expect immediately after trauma, and when it warrants clinical assessment.

Reference tool — informs practice, does not diagnose or label.

iTiming and interpretation

Time / pattern	Interpretation
Immediately after trauma	Fear, sleep disturbance, intrusive thoughts, irritability, concentration problems and avoidance can occur without indicating chronic PTSD.
Persistent / impairing	Symptoms that persist and interfere with school, relationships, sleep or daily functioning warrant clinical assessment.
Early response	Support safety, routine, caregivers and practical coping. Australian guidelines recommend against routine single-session individual psychological debriefing as a universal early intervention for children/adolescents.

PTSD in Children — How It Looks Different

The same core clusters, expressed through a child/adolescent developmental lens.

Reference tool — informs practice, does not diagnose or label.

iAdult-looking description vs child/adolescent presentation

Adult-looking description	Child/adolescent presentation may include
Intrusive memory	Repetitive trauma-themed play, behavioural reenactment, sudden distress without being able to explain the link.
Nightmare	Nightmares may not have obvious or literal trauma content.
Avoidance	Refusing a class, route, person, activity, topic or sensation that has become associated with the event.
Hyperarousal	Irritability, jumpiness, aggression, sleep problems, scanning exits, difficulty concentrating.
Negative mood/cognitions	Shame, self-blame, "I am bad", loss of interest, emotional numbing or expecting harm.

CPTSD vs PTSD vs Complex Trauma vs DTD

ICD-11 Complex PTSD; how it differs from PTSD, from "complex trauma" as a concept, and from proposed Developmental Trauma Disorder.

Reference tool — informs practice, does not diagnose or label.

iICD-11 Complex PTSD — required syndrome

Required syndrome	Three PTSD clusters + three disturbances in self-organisation (DSO)
PTSD	Re-experiencing in the present; avoidance; persistent sense of current threat.
Affect regulation	Persistent difficulty calming intense emotion and/or emotional numbing/shutdown.
Negative self-concept	Persistent beliefs of being defeated, diminished, worthless or a failure, often with pervasive shame/guilt.
Relationship disturbance	Persistent difficulty sustaining relationships or feeling emotionally close to others.
Impairment	Symptoms must cause significant difficulty in important areas of functioning.

Classification point. ICD-11 treats PTSD and CPTSD as sibling diagnoses: a person is diagnosed with one or the other, not both. DSM-5-TR does not include CPTSD as a separate diagnosis.

iCPTSD versus PTSD

PTSD	CPTSD
Core post-traumatic fear/threat syndrome.	Core PTSD syndrome PLUS pervasive disturbances in self-organisation.
May follow single or repeated trauma.	More often associated with prolonged/repeated interpersonal trauma, although ICD-11 does not require a specific trauma type.
Relationship/self-concept difficulties may occur but are not the defining additional ICD-11 structure.	Emotion regulation, negative self-concept and relationship difficulties are required DSO domains.

iComplex trauma is not the same thing as CPTSD

Complex trauma	Complex PTSD
Describes exposure to multiple/repeated traumatic experiences — often interpersonal and beginning early — and their broad developmental effects.	Formal ICD-11 diagnosis with defined symptom requirements.
Can affect attachment, emotion, cognition, behaviour, body regulation, self-concept and relationships.	Requires PTSD plus all three DSO domains and impairment.
A child can have a complex-trauma history without meeting CPTSD criteria.	CPTSD should not be inferred solely from number/severity of adverse experiences.

iDevelopmental trauma and Developmental Trauma Disorder (DTD)

Term	Status in 2026	Useful interpretation
Developmental trauma	Descriptive concept.	Focuses on trauma occurring while core regulatory, relational, cognitive and identity systems are developing.
Developmental Trauma Disorder (DTD)	Proposed diagnosis; not included in DSM-5-TR or ICD-11. Research literature reports promising validity/clinical utility but also calls for larger independent replication.	Can be used as a research/clinical formulation concept, but should not be presented as an established formal diagnosis.

Why developmental timing matters: chronic threat during development can affect emotion regulation (high reactivity, shutdown, difficulty recovering), attention/executive function (scanning competes with sustained attention), language/narrative (difficulty organising experience into coherent sequences), self-concept (shame, helplessness, identity built around danger/failure), and relationships (threat expectations, mistrust, excessive compliance, aggression or difficulty depending on adults).

Attention, Working Memory & Learning Under Threat

Why threat-system activation can look like an attention or memory problem in class.

Reference tool — informs practice, does not diagnose or label.

iThreat-related problems and classroom effects

Threat-related problem	Possible classroom result
Attention pulled toward danger cues	Missed instructions, scanning peers, poor reading comprehension.
Working-memory load	Loses steps, forgets what was just said, cannot hold instruction while regulating distress.
State-dependent performance	Can demonstrate skill when calm but lose access during activation.
Sleep / intrusive thought burden	Slower processing, fatigue, mistakes, irritability.

But check the baseline. Trauma can worsen attention and memory, but persistent lifelong executive/language problems still require consideration of ADHD, FASD, DLD, ID/BIF and learning disorders.

Language, Narrative & Trauma Disclosure

Why trauma accounts can be fragmented, and how staff should respond to disclosure.

Reference tool — informs practice, does not diagnose or label.

iWhy this matters

Problem	Why it matters
Fragmented narrative	Strong emotion, memory fragmentation and developmental language limits can make accounts nonlinear.
Abstract emotion words	Children may describe bodily sensations or behaviour rather than name fear, shame or dissociation.
Leading questions	Suggestibility and pressure can contaminate recall. Staff should avoid investigative interviewing.
Disclosure at school	Listen, use minimal open prompts, record the student's words accurately and follow safeguarding/reporting procedures. Do not promise secrecy.

Attachment and Trauma — Related but Not Interchangeable

Attachment and trauma are separate constructs that can co-occur.

Reference tool — informs practice, does not diagnose or label.

iHow they differ

Attachment	Trauma
Concerns how safety/proximity is organised in important relationships.	Concerns exposure to threat/overwhelming events and the resulting psychological/physiological effects.
Insecure/disorganised attachment is not PTSD.	PTSD does not automatically mean attachment disorder.
RAD/DSED require severe insufficient caregiving and have specific diagnostic criteria.	Trauma exposure can occur with secure attachment and without RAD/DSED.

Differential Diagnosis I — ADHD, Autism & Dissociation Look-Alikes

Trauma vs ADHD; trauma vs autism; dissociation vs ADHD, shutdown and neurological events.

Reference tool — informs practice, does not diagnose or label.

iTrauma versus ADHD

Overlap	More suggestive of trauma-related contribution	More suggestive of ADHD contribution
Inattention / restlessness	Cue-linked deterioration, hypervigilance, nightmares, avoidance, re-experiencing, abrupt state changes after reminders.	Early developmental pattern across settings/tasks, chronic inhibition/working-memory difficulties, novelty/reward effects independent of trauma cues.
Impulsivity / aggression	Defensive/reactive behaviour following perceived threat.	Broader inhibitory-control problems including neutral settings.

iTrauma versus autism

Overlap	Key distinction to investigate
Social withdrawal	Longstanding social-communication developmental differences versus acquired/changed avoidance after trauma.
Rigidity / distress with change	Autistic need for predictability/sameness versus trauma-linked threat and safety cues; both can coexist.
Sensory response	Developmental sensory processing pattern versus cue-specific trauma reminder; both may interact.
Shutdown / reduced speech	Overload/autistic shutdown versus dissociation/trauma response requires careful developmental and phenomenological history.

iDissociation versus ADHD, shutdown and neurological events

Observation	Do not jump straight to dissociation — consider
Blank stare / delayed response	ADHD, fatigue, hearing, receptive language, medication effects, seizures, dissociation.
Abrupt speech reduction	Autistic shutdown, anxiety, selective mutism, language overload, dissociation.
Memory gap	Ordinary forgetting, FASD/ID, head injury, sleep, substances, dissociation.
Feeling unreal / outside body	More specifically points toward dissociative phenomenology and warrants clinical assessment.

Differential Diagnosis II — FASD/ID, ODD/CD, Anxiety/Depression/DMDD

Further commonly confused presentations.

Reference tool — informs practice, does not diagnose or label.

iTrauma versus FASD / intellectual-adaptive difficulties

Looks similar	What to ask
Does not learn from consequences	Is the issue memory/generalisation/executive capacity, or trauma-driven avoidance/threat — or both?
Poor recall / inconsistent story	Consider neurocognitive memory, language, suggestibility and confabulation before attributing gaps to dissociation.
Social vulnerability	Adaptive judgement deficits and trauma-related trust/relationship problems can compound each other.
Dysmaturity	Developmental neurodisability can create expectations that repeatedly trigger shame and threat.

iTrauma versus ODD / Conduct Disorder

Presentation	Trauma hypothesis	ODD / CD hypothesis
Argument / refusal	Avoids cue, shame, vulnerability or perceived threat.	Persistent angry/irritable and argumentative/defiant pattern may occur beyond trauma cues.
Aggression	Often reactive/defensive and linked to threat perception.	CD can include serious aggression, deceit, property destruction or rule violations; proactive aggression may occur.
Apparent lack of remorse	Numbing, shame, dissociation, language/cognitive problems can obscure remorse.	Limited prosocial emotions require a persistent cross-context pattern and specialist assessment — not one flat response after an incident.

iTrauma versus anxiety, depression and DMDD

Condition	Important distinction
Anxiety	Fear/worry may not involve trauma re-experiencing or trauma-specific avoidance. PTSD can coexist with anxiety disorders.
Depression	Low mood, withdrawal, sleep/cognition and negative self-view overlap; assess trauma-specific intrusions/avoidance/threat.
DMDD	Chronic irritability and severe recurrent outbursts are not by themselves evidence of trauma. Look at duration, pervasiveness and developmental criteria.
Grief	Grief can involve yearning/sadness and reminders without PTSD; traumatic bereavement can involve both.

Behaviour-Reading Traps & Functional Assessment

Why trauma history does not explain every behaviour; FBA still matters; when behaviour looks deliberate but threat is driving it; one-page translation guide.

Reference tool — informs practice, does not diagnose or label.

iWhy trauma history does not explain every behaviour

Bad shortcut	Better question
"He has trauma so he escalates."	What specific antecedent reliably changes the probability of escalation?
"She lies because of trauma."	What do memory, language, shame, reinforcement history, suggestibility and consequence avoidance each contribute?
"He needs connection, not consequences."	What response maintains safety, teaches the missing skill and changes the function without humiliation?
"All behaviour is communication."	Sometimes; behaviour is also shaped by reinforcement, skill, cognition, physiology, habit and immediate goals.

Trauma-informed is not trauma-exclusive. A trauma history should broaden formulation, not shut down differential diagnosis.

iFunctional behaviour assessment still matters

FBA question	Trauma-aware extension
What happens immediately before?	Include relational/sensory reminders, perceived humiliation, loss of control, proximity and uncertainty — but code observable events where possible.
What does behaviour produce?	Escape, delay, attention, distance, control, sensory change, peer outcome, access to items/activities.
What changes probability?	Sleep, contact/family events, anniversaries, staff changes, conflict, pain, medication, cumulative demand.
What hypothesis can be tested?	Change one support/antecedent and observe whether the behaviour pattern changes. Trauma history alone is not a functional hypothesis.

iWhen behaviour looks deliberate but threat is driving it

Staff interpretation	Possible mechanism	Response implication
"He is challenging me."	Threat/authority cue, shame or defensive control.	Reduce public power struggle; keep boundary concise and predictable.
"She is attention seeking."	Seeking safety/reassurance or checking adult availability.	Provide predictable check-ins without making escalation the best route to contact.
"He is manipulating."	Behaviour successfully changes distance, demand or adult response.	Analyse function without moralising; teach a safer direct replacement.
"She went from 0 to 100."	Earlier internal activation may have been missed or dissociated from awareness.	Track precursors and lower demands before peak activation where feasible.

✓One-page school behaviour translation guide (quick reference)

What staff see	Possible trauma-related hypothesis	Also check	Useful first adjustment
"Ignoring me"	Threat monitoring, dissociation, avoidance.	ADHD, hearing, DLD, FASD, sleep.	Gain attention calmly; one short instruction; verify understanding.
Refusal / leaving	Avoidance of reminder, shame, perceived entrapment.	Task difficulty, PDA, reinforcement, sensory load.	Offer predictable path/choice; reduce public confrontation; keep core boundary.
Sudden aggression	Reactive defence after perceived threat/humiliation.	ODD/CD, ADHD impulsivity, peer function, substance use.	Create distance; one lead adult; defer analysis until regulated.
Blank / staring	Dissociation or overload.	ADHD, seizure, fatigue, autism, medication.	Reduce demand; orient gently; document duration/context; refer if concerning.
"Lying" / changing story	Memory fragmentation, shame, avoidance.	DLD, FASD, ID/BIF, confabulation, ordinary deception.	Use neutral fact-finding; avoid repeated leading interrogation.
Constant scanning	Hypervigilance.	Anxiety, bullying, real current risk.	Improve environmental predictability and actual safety.
Explodes after correction	Shame/threat response.	ODD, DMDD, learning difficulty, adult interaction pattern.	Private, brief correction; state next action rather than character judgement.
Clingy / repeated reassurance	Safety-seeking after threat.	Attachment anxiety, general anxiety, reinforcement history.	Predictable check-in routine; build independent coping gradually.
Emotionally flat	Numbing / dissociation.	Depression, autism, medication, temperament.	Do not demand emotional performance; assess functioning and risk.
Won't talk about incident	Trauma avoidance, shame, language collapse.	Ordinary privacy, DLD, fear of consequence.	Do not force disclosure; use safeguarding process if needed; revisit practical plan later.

Working sequence: observe → rule out immediate danger → reduce unnecessary threat → establish the behaviour function → consider trauma alongside neurodevelopmental/language explanations → teach a replacement → review whether the plan actually changes the pattern.

Trauma-Informed Practice — Consequences, Escalation & Repair

Principles for boundaries, what to change in the moment, and how to repair after incidents.

Reference tool — informs practice, does not diagnose or label.

iConsequences, boundaries and trauma-informed practice

Principle	What it looks like
Safety still matters	Aggression, threats, sexualised behaviour, weapons or serious risk require clear safety responses. Trauma does not excuse harm.
Avoid humiliation as a teaching method	Public shaming, sarcasm, intimidation and unpredictable punitive responses can increase threat without teaching replacement skills.
Use consequences that connect	Restitution, repair, loss of access linked to safety, re-teaching and rehearsal are more instructive than unrelated punishment.
Separate regulation from accountability	A student may need to return to a usable state before discussing responsibility. Accountability can occur after regulation.

iEscalation: what adults should change in the moment

Reduce	Increase
Crowding, multiple adults talking, rapid questioning, public correction, sudden touch, long explanations, threats about distant future consequences.	Space, one lead adult, short concrete language, predictable choices, visible exit/safety, time to process, neutral tone.
Demand for immediate narrative ("tell me exactly what happened").	Immediate safety and regulation; factual debrief later when cognition is available.

iRepair after incidents

Step	Purpose
Return to baseline first	Do not confuse physical quiet with full cognitive recovery; allow enough time for usable attention/language.
Re-establish predictability	State what remains the same: relationship, boundary, next step, timetable.
Review briefly	Focus on observable sequence, missing skill and safer alternative rather than extracting a confession.
Repair harm	Where appropriate, make restitution achievable and concrete. Avoid forced public apologies as proof of remorse.
Update the plan	If the same sequence repeats, adult/environmental changes are needed — not just another lecture.

School Documentation, Assessment & Screening

What schools should document, and how trauma/PTSD/CPTSD/dissociation assessment works.

Reference tool — informs practice, does not diagnose or label.

iWhat schools should document

Document	Useful detail
Antecedent context	Exact demand, adult language, location, peers, noise, proximity, transition, unexpected change.
Observable behaviour	What was said/done, intensity, duration, latency, recovery — not "trauma response" as an observation.
State changes	Sudden freezing, staring, confusion, loss of speech, shaking, scanning, startle, apparent unreality statements.
Recovery	What reduced activation, how long it took, what language/support helped or worsened it.
Pattern across settings	Specific adults, times, anniversaries, locations or cue categories; also occasions where the expected trigger did NOT produce behaviour.

iAssessment and screening

Area	Examples / cautions
Trauma/PTSD symptoms	Clinical interview plus validated child/adolescent PTSD measures; tools may include the UCLA PTSD Reaction Index, Child and Adolescent Trauma Screen (CATS) or TSCC depending on context.
CPTSD	The International Trauma Questionnaire — Child and Adolescent version (ITQ-CA) is used in research/assessment; young-person evidence is growing but less mature than adult evidence.
Dissociation	Clinical history and dissociation measures may support assessment. "Spacing out" alone is insufficient. Medical/neurological causes may need exclusion.
Differential diagnosis	Developmental history, ADHD/ASD/FASD/DLD/ID, sleep, substance use, medical history, attachment/care history, mood/anxiety and behaviour patterns.
School role	Provide high-quality functional observations and developmental/learning information; do not diagnose PTSD/CPTSD from a checklist.

Treatment — What the Evidence Supports

Australian PTSD Guidelines positions on intervention. School boundary: this is clinical territory.

Reference tool — informs practice, does not diagnose or label.

iIntervention / principle and current evidence position

Intervention / principle	Current evidence position
Trauma-focused CBT for children/adolescents with PTSD symptoms	Strongly recommended in the Australian PTSD Guidelines; adapted to age/development and often includes caregiver involvement where appropriate.
EMDR	Conditionally recommended for children/adolescents where trauma-focused CBT is unavailable or unacceptable.
Early CFTSI	Australian guidelines conditionally recommend Child and Family Traumatic Stress Intervention as an indicated early intervention for at-risk 7–17 year olds.
Single-session psychological debriefing	Conditionally recommended against as a universal early intervention for children/adolescents.
Complex presentations	Treatment should be individualised to safety, comorbidity, development and functioning. Complex trauma is not an argument for schools to conduct trauma processing.

School boundary. School staff can provide predictability, regulation support and functional accommodations. Trauma memory processing and diagnosis belong with appropriately trained clinicians.

Evidence Base & Current Resources

Evidence hierarchy and reference list, as printed in the source document.

Reference tool — informs practice, does not diagnose or label.

iEvidence hierarchy used

Diagnostic statements are anchored to WHO ICD-11 and DSM-5-TR context; Australian treatment statements are anchored to Phoenix Australia guidelines. Developmental trauma/DTD material is explicitly separated from established diagnoses. School behaviour interpretations are hypotheses, not diagnostic signs.

iReferences

World Health Organization (2024) — Clinical Descriptions and Diagnostic Requirements for ICD-11 Mental, Behavioural or Neurodevelopmental Disorders (CDDR). who.int
Phoenix Australia — Australian Guidelines for the Prevention and Treatment of Acute Stress Disorder, Posttraumatic Stress Disorder and Complex PTSD. phoenixaustralia.org
Phoenix Australia (treatment chapter) — Australian PTSD Guidelines — Classification and grouping of interventions; child/adolescent recommendations include TF-CBT, EMDR and CFTSI. phoenixaustralia.org
American Psychiatric Association — DSM-5-TR updates and assessment measures, including PTSD and dissociation severity measures. psychiatry.org
National Child Traumatic Stress Network — Complex Trauma: definition, developmental effects and intervention resources. nctsn.org
National Child Traumatic Stress Network — Effects of Complex Trauma — attachment, dissociation, cognition, self-concept and behaviour. nctsn.org
NCTSN — Dissociation and PTSD — what providers/parents should know. nctsn.org
Sarr et al. (2024) — Systematic review of assessment of ICD-11 CPTSD in young people and adults. Clinical Psychology & Psychotherapy. pubmed.ncbi.nlm.nih.gov
Sachser et al. / youth ICD-11 literature — Research supports distinguishable PTSD/CPTSD profiles in young people, while the youth evidence base remains smaller than the adult literature. pmc.ncbi.nlm.nih.gov
Ford (2023) — Why We Need a Developmentally Appropriate Trauma Diagnosis for Children: a 10-Year Update on Developmental Trauma Disorder. pmc.ncbi.nlm.nih.gov
Systematic review of DTD criteria — Existing studies are broadly supportive but replication by larger independent samples is still needed. pubmed.ncbi.nlm.nih.gov
VA National Center for PTSD — Complex PTSD: assessment and treatment; ICD-11 PTSD + disturbances in self-organisation. ptsd.va.gov

!Bottom line

The most useful trauma-informed question in behaviour work is not "What trauma caused this?" It is "What is the student detecting as threat, what observable function does the behaviour serve, what alternative explanations remain, and what adult/environmental change improves safety and performance without removing appropriate boundaries?"