Reference Guide — Australian practice context, 2026. Covers diagnosis logic, assessment, functional interpretation, differential diagnosis, and behaviour and school response.
This guide supports formulation, observation and educational planning. It should not be used to diagnose intellectual disability, assign an IQ, determine legal capacity, or make NDIS eligibility decisions. Those require appropriate professional assessment and the relevant legal/administrative process. Intellectual disability requires formal assessment of both intellectual functioning and adaptive functioning. Borderline intellectual functioning (BIF) is clinically useful language but is not a stand-alone DSM-5-TR or ICD-11 disorder category.
| Term | Key point |
|---|---|
| Intellectual disability | Significant limitations in both intellectual functioning and adaptive behaviour, with onset during the developmental period. |
| Adaptive functioning | What the person typically manages in everyday conceptual, social and practical life — not what they can do once in ideal conditions. |
| BIF | A commonly used description for people functioning below the average range but not necessarily meeting criteria for intellectual disability; the literature often uses IQ around 70–85. |
| Big school trap | Speech, size, age, confidence and learned scripts can make a student look far more capable than their reasoning, judgement or adaptive functioning actually is. |
| Main practical rule | Set expectations from demonstrated capacity in the relevant domain, not from chronological age, verbal fluency or what the student managed once. |
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. Avoids overestimating capacity, distinguishes “won’t” from “can’t”, and simplifies adult communication.
A$100
One of the three AAIDD adaptive functioning domains — language, literacy, number, money, time, memory, self-direction and problem solving.
Reference tool — informs practice, does not diagnose or label.
Adaptive functioning asks what the person usually does, how independently, how consistently, and how safely — not what they can do once in ideal conditions. The conceptual domain covers language and literacy, number/money/time, memory and self-direction, and problem solving and judgement.
| Area | Possible school presentation |
|---|---|
| Language / literacy | Understands concrete language better than abstract explanation; weak reading comprehension despite decoding; difficulty explaining reasoning. |
| Number / money / time | Can count or calculate in class but struggles to use money, estimate duration, plan arrival times or understand debt/change. |
| Memory / self-direction | Forgets multi-step instructions, loses track of goals, needs external prompts and struggles to independently organise work. |
| Problem solving / judgement | Uses learned rules rigidly, struggles with novel situations and may repeat an ineffective solution. |
Social judgement, rules and responsibility, gullibility/naivety, and communication that can mask confusion.
Reference tool — informs practice, does not diagnose or label.
The social domain covers how a person reads people and situations — motives, sarcasm, friendship quality, manipulation, threats and trustworthiness — and whether they can apply a known rule when peers, emotion or novelty change the situation.
AAIDD explicitly includes gullibility, naivety, social problem-solving and avoiding victimisation within adaptive social skills. This is not peripheral — it can be central to safety.
| Area | Possible presentation |
|---|---|
| Social judgement | Misreads motives, sarcasm, friendship quality, manipulation, threats or whether another person is trustworthy. |
| Rules and responsibility | May know a rule verbally but fail to apply it when peers, emotion or novelty change the situation. |
| Gullibility / naivety | May believe implausible stories, hand over belongings, follow older peers or accept blame/suggestions too readily. |
| Communication | May agree, laugh or copy language to hide confusion; apparent social confidence can conceal weak comprehension. |
Daily routines, safety and health, organisation, and independent living skills.
Reference tool — informs practice, does not diagnose or label.
The practical domain covers what the person typically manages in everyday tasks — and how independently, consistently and safely they manage them, rather than what they can do once, in ideal conditions.
| Area | What functioning may involve |
|---|---|
| Daily routines | Preparing, dressing, hygiene, packing, arriving, following schedules and transitioning without repeated prompting. |
| Safety / health | Recognising danger, medication routines, seeking help, managing minor injuries and responding appropriately in emergencies. |
| Organisation | Managing belongings, devices, homework, appointments, transport and multi-stage tasks. |
| Independent living skills | Food preparation, shopping, cleaning, travel, work routines, money use and communicating with services. |
ID, BIF and adaptive functioning in one page; DSM-5-TR, ICD-11 and AAIDD; the diagnostic logic.
Reference tool — informs practice, does not diagnose or label.
| Question | Practical answer |
|---|---|
| Is intellectual disability just a low IQ? | No. Modern diagnosis requires significant limitations in intellectual functioning AND adaptive functioning, with developmental onset. |
| Is adaptive functioning the same as intelligence? | No. Intelligence tests estimate cognitive abilities; adaptive measures examine everyday conceptual, social and practical performance. |
| Is BIF intellectual disability? | Not automatically. BIF usually describes below-average intellectual functioning that does not clearly meet full ID criteria. Adaptive functioning is crucial to the distinction. |
| Can someone talk well and still have major cognitive limitations? | Absolutely. Fluent conversation, humour, confidence and memorised language can conceal weak reasoning, working memory, judgement and generalisation. |
| Can schools diagnose ID? | No. Schools provide crucial data, but diagnosis requires appropriately qualified assessment using intellectual, adaptive, developmental and contextual evidence. |
| System | Term / emphasis | Practical implication |
|---|---|---|
| DSM-5-TR | Intellectual Disability (Intellectual Developmental Disorder). Diagnosis considers intellectual deficits, adaptive deficits and developmental onset; severity is primarily based on adaptive functioning. | Do not use IQ alone to assign severity. |
| ICD-11 | Disorders of intellectual development. Intellectual and adaptive functioning are both central; mild, moderate, severe and profound levels are described. | Behavioural indicators can support clinical judgement where testing is limited. |
| AAIDD | Intellectual disability is significant limitation in intellectual functioning and adaptive behaviour across conceptual, social and practical skills, originating in the developmental period. | Assessment is intended to identify support needs, not just create a label. |
| Australian practice | Reports may use DSM wording, ICD wording, NDIS functional-capacity language, or educational disability categories. | Read the actual scores, adaptive profile and functional description rather than relying only on the label. |
| Requirement | What it means | What is not enough |
|---|---|---|
| Intellectual functioning | Marked limitation in reasoning, problem solving, learning, abstraction and related cognitive functions, assessed with suitable standardized methods and clinical judgement. | One weak subtest or poor school marks. |
| Adaptive functioning | Significant limitation in everyday conceptual, social and/or practical functioning relative to age and cultural context. | Being immature, disorganised or dependent in one isolated situation. |
| Developmental onset | The pattern originates during the developmental period. | An adult decline after previously typical functioning; consider injury, illness or neurocognitive disorder instead. |
IQ scores are estimates, not exact numbers.
Reference tool — informs practice, does not diagnose or label.
| IQ can help estimate | IQ does NOT directly tell you |
|---|---|
| Reasoning, verbal comprehension, visual-spatial/perceptual reasoning, working memory and processing abilities depending on the test. | Whether the student can safely travel alone, resist peer pressure, manage money, remember medication, cope with a timetable change or understand a consequence tomorrow. |
| General level and pattern of cognitive performance under standardized conditions. | Motivation, morality, effort in every setting, emotional regulation, practical independence or how much support is required in real life. |
| Issue | Why it matters |
|---|---|
| Measurement error | A reported IQ is an estimate with a confidence interval. Treating 69 and 71 as biologically different categories is poor practice. |
| Profile scatter | A Full Scale IQ can hide marked strengths and weaknesses. Language, working memory or processing speed may be very uneven. |
| Testing conditions | Fatigue, anxiety, attention, language background, hearing/vision, motor demands and unfamiliarity can alter performance. |
| Practice effects / outdated testing | Recent repeated testing and old norms can distort interpretation. The psychologist should consider validity and timing. |
Severity is not just an IQ score. Mild intellectual disability is easy to miss.
Reference tool — informs practice, does not diagnose or label.
| Old shortcut | Current better approach |
|---|---|
| "IQ 55 means moderate." | DSM-5-TR severity is based mainly on adaptive functioning because support need is better reflected by real-world conceptual, social and practical functioning. |
| "They are mild, so they need little support." | "Mild" can still mean substantial difficulty with money, time, judgement, literacy, complex communication, independent living and vulnerability. |
| "Their IQ improved so the disability is gone." | Scores can vary; functioning and developmental history still require interpretation. Adaptive demands also increase with age. |
| Why it gets missed | What adults may wrongly conclude |
|---|---|
| Good conversational language | "He understands everything I say." |
| Physically mature / socially confident | "She should know better at her age." |
| Copies peers and routines | "He can do it independently." |
| Can perform a task after modelling | "She learned it, so she should remember next week." |
| Can explain the rule after the event | "He chose to break it, therefore capacity was fine in the moment." |
Clinically useful language — not a stand-alone DSM-5-TR or ICD-11 disorder category.
Reference tool — informs practice, does not diagnose or label.
| Feature | Current understanding |
|---|---|
| Typical research range | Many studies use IQ approximately 70–85, but modern diagnostic systems do not define BIF by a single hard cut-off. |
| Clinical status | BIF is not the same as intellectual disability and is not a stand-alone DSM-5-TR or ICD-11 mental disorder. It can still be a major focus of clinical/educational attention. |
| Function | Students may show meaningful problems in working memory, academic learning, adaptive skills, judgement and independence even though they miss formal ID thresholds. |
| Why it matters | The student can fall into a service gap: expected to function like average peers but needing substantially more repetition, scaffolding and supervision. |
| Statement | Accurate interpretation |
|---|---|
| "BIF means mild ID." | No. There is overlap near the boundary, but ID requires significant intellectual AND adaptive limitations with developmental onset. |
| "BIF is just low-average and irrelevant." | Also wrong. For some students, lower general cognitive capacity meaningfully affects school learning, judgement and daily functioning. |
| "IQ 80 proves BIF." | Too simplistic. Test validity, confidence intervals, cognitive profile and functional impact matter. |
| "No diagnosis means no support need." | False. Educational adjustments should respond to demonstrated disability/learning need, not merely to a diagnostic label. |
| Question | BIF pattern | Mild intellectual disability |
|---|---|---|
| Intellectual functioning | Often below average, commonly in the 70–85 research range. | Significantly below average on suitable assessment, interpreted with measurement error. |
| Adaptive functioning | May be weak, uneven or situational; not necessarily significantly impaired enough for ID. | Significant adaptive limitation is required. |
| Classification | Not a stand-alone mental disorder in DSM-5-TR/ICD-11. | Formal neurodevelopmental diagnosis when criteria are met. |
| Support | Can still require substantial educational and functional support. | Support intensity depends on the individual adaptive profile, not label alone. |
Knowing something is not the same as using it.
Reference tool — informs practice, does not diagnose or label.
| Looks like | But may actually be |
|---|---|
| Long conversation, jokes, slang and swearing | Well-practised social language with weak comprehension of complex instructions, consequences or abstract concepts. |
| Repeats your wording back | Echoing or short-term retention rather than deep understanding. |
| Says "yeah, I get it" | Acquiescence, embarrassment, desire to end the conversation, or not knowing what they failed to understand. |
| Excellent knowledge of a preferred topic | A genuine strength that does not necessarily generalise to planning, social judgement, literacy or everyday independence. |
| Knowledge task | Performance demand |
|---|---|
| "What is the school rule?" | Recognise the situation, inhibit impulse, remember the rule, predict the outcome and choose the response while emotionally activated. |
| "What should you do if you miss the bus?" | Actually problem-solve when alone, stressed, short on money and unsure whom to contact. |
| "Why was that unsafe?" (after the event) | Detect risk before the event, resist peers and generalise yesterday's lesson to a new context. |
Cognitive load, initiation, time/money/cause-effect reasoning, and why "mental age" is poor practice.
Reference tool — informs practice, does not diagnose or label.
| Demand | Possible effect |
|---|---|
| Long verbal instruction | Early information drops out while the student is still processing the later part. |
| Fast correction / questioning | Student guesses, agrees, becomes defensive or gives apparently inconsistent answers. |
| Multiple simultaneous expectations | Attention is consumed by remembering steps, managing emotion and monitoring peers; behaviour deteriorates. |
| Time pressure | Accuracy and self-regulation may collapse even when the skill exists under slower conditions. |
| Adult description | Possible executive problem |
|---|---|
| "He just sits there." | Task initiation: cannot organise the first step without an external cue. |
| "She never learns to bring the right stuff." | Planning, prospective memory and routine organisation. |
| "He keeps doing the same stupid thing." | Weak inhibition, flexible problem-solving or transfer from past consequences. |
| "She can do every step but never finishes." | Sequencing, monitoring, working memory, fatigue or loss of goal. |
| Concept | Why it can be difficult |
|---|---|
| Time | "Later", "next week", duration, deadlines and estimating how long actions take are abstract. |
| Money | Knowing coin values is different from budgeting, change, value comparisons, debt, subscriptions and resisting pressure. |
| Consequences | Future outcomes may carry much less weight than immediate reward, peer approval or escape. |
| Hypotheticals | "What would happen if...?" requires holding information, imagining alternatives and predicting chains of events. |
| Useful | Not useful |
|---|---|
| "At 15, his money-management and independent planning are substantially below age expectation and require direct support." | "He has the mental age of an 8-year-old." |
| Describe strengths and limitations by domain. | Treating the whole person as a younger child. |
| Match the support to the specific task and risk. | Assuming social, sexual, emotional and cognitive development all sit at one single age. |
Social judgement, gullibility and exploitation risk; independence, consent and justice risk in adolescence.
Reference tool — informs practice, does not diagnose or label.
| Risk | What it can look like |
|---|---|
| Peer manipulation | Carries items, takes blame, joins offending behaviour, gives away passwords/money or follows plans they only partly understand. |
| Online interaction | Takes claims literally, overshares information, responds to scams or misjudges sexual/social intent. |
| Authority / questioning | Agrees with leading questions, changes answers to please the adult, or assumes the adult must be correct. |
| Friendship | May confuse attention with friendship and tolerate exploitation to remain included. |
| Growing expectation | Potential mismatch |
|---|---|
| More unsupervised time | Weak transport, money, emergency, online or stranger judgement can become safety issues. |
| Peer status matters more | Gullibility and desire for acceptance can increase exploitation or participation in risky/offending behaviour. |
| Sexual/romantic relationships | Consent education must be concrete, repeated and matched to actual comprehension; do not assume mature appearance equals mature judgement. |
| Police / formal interviews | Language, suggestibility, acquiescence and understanding of rights can affect reliability and participation. Appropriate supports may be required. |
| Transition to work/adult services | Planning, punctuality, communication, money, self-advocacy and flexible problem solving may need explicit teaching and ongoing scaffolding. |
How ID/BIF compares with, and can co-occur with, four commonly confused presentations.
Reference tool — informs practice, does not diagnose or label.
| Feature | ID / broad cognitive limitation | Specific Learning Disorder |
|---|---|---|
| Pattern | Broad intellectual/adaptive impact. | Persistent difficulty in a specific academic area such as reading, writing or maths despite otherwise stronger general ability. |
| Everyday reasoning | May also be limited. | Often broadly age-appropriate outside affected learning domains. |
| Assessment | Intellectual + adaptive + developmental/contextual evidence. | Achievement, response to instruction and cognitive/educational assessment focused on the academic difficulty. |
| DLD may look cognitively weak because | ID / BIF may look language-impaired because |
|---|---|
| Poor comprehension reduces performance on verbally loaded tasks; word finding and grammar make reasoning hard to express. | Broad reasoning and learning limitations affect vocabulary growth, complex language, narrative and comprehension. |
| Non-verbal reasoning may be significantly stronger than language. | Weakness tends to extend beyond language into learning, abstraction or adaptive functioning. |
| A speech pathologist and psychologist may need to interpret results together. | Do not assume low verbal scores alone establish intellectual disability. |
| ADHD mechanism | ID / BIF mechanism | Overlap |
|---|---|---|
| Inattention, impulsivity, executive dysfunction can cause inconsistent performance despite adequate reasoning capacity. | The reasoning/learning demand itself may exceed capacity, even with good attention. | Both can cause forgetting, poor planning, impulsive decisions, school failure and dependence on prompts. |
| Performance may improve substantially when attention and executive load are managed. | Simplifying only distractions may not fix a task that remains conceptually too difficult. | They commonly co-occur; do not force an either/or explanation. |
| Autism | ID / BIF | Key point |
|---|---|---|
| Core differences involve social communication/interaction and restricted or repetitive patterns. | Core issue is significant limitation in intellectual and adaptive functioning. | Autism can occur with any intellectual level, including intellectual disability. |
| A person may have excellent reasoning but marked autistic social/sensory differences. | Social difficulty may arise from developmental level, judgement, language and adaptive limitations. | Assessment should establish both profiles when both are suspected. |
How ID/BIF compares with, and can co-occur with, four more commonly confused presentations.
Reference tool — informs practice, does not diagnose or label.
| FASD | ID / BIF | Important overlap |
|---|---|---|
| Neurodevelopmental impairment associated with prenatal alcohol exposure under current Australian diagnostic criteria. | ID is defined by intellectual + adaptive limitation, regardless of cause. | FASD can include intellectual disability, BIF-range cognition or average IQ with severe deficits in other domains. |
| Marked inconsistency across domains may be prominent. | A more globally low profile may occur, but individual scatter is still common. | Adaptive functioning may be much poorer than conversational ability in both. |
| Trauma-related performance problem | Developmental intellectual limitation |
|---|---|
| Threat, avoidance, sleep disruption, dissociation and hyperarousal can reduce attention, memory and school performance. | Broad limitation is developmentally established and persists beyond episodes of threat or acute stress. |
| Function may vary sharply with safety and triggers. | Function may also vary with support/load, but core reasoning/adaptive limitations remain evident across time. |
| Severe deprivation can affect development and must be assessed carefully. | Trauma history does not exclude ID; both may coexist. |
| Observed behaviour | Capacity question before calling it defiance/conduct |
|---|---|
| Repeated rule breaking | Did the student understand the rule, recognise when it applied, remember it under load and predict the consequence? |
| "Lying" | Could this be memory error, suggestibility, language confusion, shame avoidance or trying to give the expected answer? |
| Failure to change after consequences | Was the consequence temporally connected, understood, remembered and transferable to the next situation? |
| Peer-led offending | Could gullibility, desire for inclusion or weak social judgement be contributing? |
| Developmental ID / BIF | Acquired change |
|---|---|
| Limitations originate during development. | A meaningful decline or new cognitive/behavioural difficulty follows injury, illness, neurological event or later neurodegenerative process. |
| School history often shows longstanding learning/adaptive difficulty. | Earlier functioning may have been substantially stronger. |
| Developmental records are important. | Compare pre- and post-event function; medical/neuropsychological assessment may be required. |
Do not assume every change in behaviour is "just the disability."
Reference tool — informs practice, does not diagnose or label.
| Mistake | Better question |
|---|---|
| "That is just their disability." | Is there a new change in sleep, appetite, affect, withdrawal, aggression, functioning or somatic complaint suggesting mental or physical illness? |
| Expecting sophisticated emotional explanations | Can distress be assessed using developmentally appropriate language, observation and reports from people who know the student well? |
| Assuming behaviour = psychiatric disorder | Could pain, communication difficulty, sensory distress, bullying, medication, environment or task mismatch explain the change? |
When behaviour looks deliberate but capacity is the problem; lying, confabulation, acquiescence and suggestibility; why repetition does not prove understanding; escalation and shame; the one-page translation guide.
Reference tool — informs practice, does not diagnose or label.
| Adult interpretation | Possible capacity-based explanation |
|---|---|
| "Lazy" | Task is too complex to organise; initiation or generalisation fails. |
| "Doesn't care" | Limited emotional language, shame, slow processing, or weak understanding of the social impact. |
| "Manipulative" | Uses the few strategies that have reliably obtained help, escape, access or connection. |
| "He knows better" | Can state the rule after the event but cannot consistently deploy the required judgement/inhibition in the moment. |
| "She refuses independence" | The expected task exceeds practical/adaptive capacity and previous failure makes avoidance rational. |
| Mechanism | What it can produce |
|---|---|
| Deliberate deception | A knowingly false account used to obtain a goal or avoid an outcome. Capacity limitations do not make this impossible. |
| Memory reconstruction / confabulation | The person fills gaps without consciously intending to deceive; detail may shift as questions continue. |
| Acquiescence | Saying yes, agreeing with the adult or choosing the last option because comprehension is weak or disagreement feels unsafe. |
| Suggestibility | Leading questions or repeated interviewing alter the account; the student may incorporate information provided by others. |
| Why consequences may fail | What to change |
|---|---|
| Delayed consequence | Make feedback immediate and concrete where possible. |
| Weak cause-effect reasoning | Explicitly connect behaviour → outcome; do not assume the student infers the link. |
| Memory failure | Use visual/rehearsed prompts at the point of performance, not only post-incident discussion. |
| Poor generalisation | Teach the same rule across multiple examples/settings and show what changes versus stays the same. |
| Future consequence loses to immediate reward | Change antecedents, supervision and reinforcement rather than endlessly increasing punishment. |
| Sequence | Possible process |
|---|---|
| Task presented | Student detects that the work is beyond capacity or likely to expose difficulty. |
| Delay / joking / disruption | Avoidance protects status and delays failure. |
| Adult increases pressure | Language load, shame and cognitive demand rise. |
| Student argues / leaves / escalates | Escape becomes more valuable and thinking becomes less available. |
| Afterwards | Student may genuinely struggle to explain what happened or transfer the discussion to next time. |
| What adults see | Possible mechanism to test | Useful first response |
|---|---|---|
| "Ignores instructions" | Language too complex, working-memory overload, slow processing. | Shorten; one step; visual cue; ask them to show the first action. |
| "Lazy / won't start" | Initiation failure, task complexity, fear of exposed difficulty. | Start the first step together; reduce task size; model completion. |
| "Lies" | Memory gap, acquiescence, suggestibility, shame avoidance or deliberate deception. | Neutral questions; reduce leading; corroborate facts; separate mechanism from moral label. |
| "Knows the rule but keeps breaking it" | Weak generalisation, future consequence salience, inhibition or social judgement. | Prompt at point of performance; rehearse examples; adjust supervision and reinforcement. |
| "Acts younger than age" | Adaptive skills below chronological expectation in that domain. | Describe the specific functional gap and scaffold it; avoid mental-age labels. |
| "Copies bad peers" | Gullibility, social inclusion need, weak risk appraisal. | Teach concrete red flags; plan exit/help scripts; increase protective supervision. |
| "Doesn't care about consequences" | Abstract future outcomes are weak, memory poor, immediate reward stronger. | Use immediate concrete feedback and antecedent design rather than escalating delayed punishment. |
| "Can do it when they want" | Performance depends on familiarity, prompting, stress and cognitive load. | Compare conditions systematically before assuming motivation is the sole variable. |
What a proper assessment should include; common tools; cultural, linguistic, sensory and motor fairness.
Reference tool — informs practice, does not diagnose or label.
| Component | Why it matters |
|---|---|
| Developmental / educational history | Establishes developmental onset, trajectory, attendance, intervention history and prior functioning. |
| Standardized intellectual assessment | Estimates intellectual functioning and cognitive profile using age-appropriate, valid tools. |
| Standardized adaptive assessment | Measures typical everyday conceptual, social and practical functioning using knowledgeable informants and appropriate instruments. |
| Academic / language assessment | Separates broad cognitive limitation from specific learning or language disorders. |
| Medical / sensory / neurodevelopmental review | Considers hearing, vision, genetic/medical conditions, FASD, autism, ADHD, neurological factors and other contributors. |
| Context and validity | Considers culture, language, motivation, communication, behaviour, opportunity to learn and whether the scores are interpretable. |
| Type | Examples | Purpose / caution |
|---|---|---|
| Intellectual functioning | WISC-V, WAIS-IV/WAIS-5 where available, Stanford-Binet, nonverbal measures when appropriate. | Standardized estimate of cognitive functioning. The psychologist chooses a test suited to age, language, sensory/motor and referral question. |
| Adaptive behaviour | Vineland-3, ABAS-3, DABS. | Typical everyday performance across conceptual/social/practical skills. Informant quality and context matter. |
| Functional capacity | PEDI-CAT, WHODAS 2.0 and discipline-specific functional assessment may contribute in disability-service contexts. | Not interchangeable with an ID diagnosis; used to describe functional impact/support need. |
| Academic/language | Standardized achievement and speech-language measures. | Help identify specific learning/language disorders and explain uneven profiles. |
| Factor | Assessment risk |
|---|---|
| Language / multilingual background | Verbal testing may underestimate reasoning if proficiency and cultural exposure are not considered. |
| Culture / opportunity | Adaptive expectations must be interpreted against realistic age, community and cultural demands, not one narrow lifestyle. |
| Hearing / vision | Unrecognised sensory impairment can depress test and classroom performance. |
| Motor / speech limitations | Timed or verbally demanding tasks may underestimate knowledge if access needs are ignored. |
| Behaviour / anxiety | Refusal, shutdown or unfamiliarity may invalidate parts of testing rather than prove low ability. |
What schools can document that is genuinely useful, and the full classroom / behaviour-support design toolkit.
Reference tool — informs practice, does not diagnose or label.
| Document | Useful detail |
|---|---|
| Instruction following | How many steps, wording complexity, delay, prompts, visual support and whether learning generalises later. |
| Independence | What the student completes without prompts versus with modelling, checklists, adult proximity or repeated reminders. |
| Problem solving | What happens when a familiar routine changes or a novel problem appears. |
| Adaptive/social judgement | Money, time, transport, peer pressure, online safety, help-seeking, vulnerability and practical routines. |
| Academic response | Rate of acquisition, repetition needed, retention over days/weeks and transfer to new examples. |
| Behaviour context | Task complexity, language load, uncertainty, peer influence, shame, fatigue and consequences rather than labels like "defiant". |
| Need | Useful adjustment |
|---|---|
| Reduce cognitive load | One instruction at a time; short concrete language; visual models; reduce unnecessary choices and verbal explanation. |
| Externalise memory | Checklists, timers, labelled materials, schedules, worked examples and prompts at the point of action. |
| Teach for generalisation | Practise the skill across people, places and examples; explicitly identify what is the same. |
| Match task to demonstrated capacity | Adjust complexity without infantilising interests, tone or dignity. |
| Increase successful practice | High rates of correct, supported repetitions before expecting independence. |
| Protect against predictable risk | Environmental safeguards, supervision and direct teaching where judgement or vulnerability is weak. |
| Check understanding | Ask the student to show or explain what they will do next; avoid "Do you understand?" as the only check. |
Source hierarchy and reference list, as printed in the source document.
Reference tool — informs practice, does not diagnose or label.
The diagnostic framework in this handbook is anchored to AAIDD and WHO/ICD-11, with current Australian NDIS and AIHW material used for local functional/disability context. BIF sections are deliberately cautious because terminology and thresholds remain inconsistent across classification systems and research.
This guide supports formulation, observation and educational planning. It should not be used to diagnose intellectual disability, assign an IQ, determine legal capacity, or make NDIS eligibility decisions. Those require appropriate professional assessment and the relevant legal/administrative process.