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Understanding autism
Understanding autism

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Control group

A group of participants in an experiment or other systematic study used as a standard against which others are measured. This could be a group who do not receive an intervention, or it could be a group who do not have autism.

Controlled study

A formal evaluation of an intervention, with more participants than a pilot study. Typically it would involve two groups of participants on the autism spectrum, matched for level of symptoms, age and IQ. One group receives the intervention and the other receives no intervention or treatment as usual. Comparing the groups’ skills and behaviours after the study permits efficacy of the intervention to be evaluated.

Coordinated Support Plan (CSP)

A legal document in Scotland drawn up by the local authority, after specialist reports are obtained, which specifies the support a child or young person up to age 19 needs in school.


Deoxyribonucleic acid (DNA)

Complex molecules in cells that contain the instructions necessary in the development and functioning of all living organisms. DNA consists of long twisted strands, each composed of a precise sequence of units. Sections of these units form genes.


Describes a condition or process which unfolds during child development. Development may reflect a typical pattern in which certain skills and behaviours are attained, following broadly the same time frame in different children. In atypical development, for instance in autism, certain key processes such as language and communication develop at a different rate, in a different way or not at all. (See also developmental trajectory.)

Developmental trajectory

A term for the developmental sequence. This emphasises two facets of typical development: (1) There is a characteristic sequence of 'milestones' such as crawling, sitting up and walking. (2) Early developmental skills such as pointing and looking are thought to lay the foundations for later more sophisticated skills such as play with siblings, friendships with peers, or the complex relationships of the teenage years and adulthood. The idea of an atypical developmental trajectory is an important concept in work on autism.

Diagnostic and Statistical Manual of Mental Disorders (DSM)

The American Psychiatric Association's formal system for the classification and diagnosis of psychiatric, mental health and developmental conditions, which includes criteria for diagnosing autism. The 5th edition, published in 2013, dispensed with the diagnostic sub-types of autism (e.g. Asperger Syndrome) seen in earlier versions. The DSM-5 approach to classifying and diagnosing autism treats it as a continuous spectrum and uses severity scores and specifiers to characterise each individual’s strengths and weaknesses.

Diagnostic criteria

Formal descriptions of medical, psychiatric and developmental conditions, used in making diagnoses. The criteria comprise a list of symptoms or features that an individual must have for a condition or problem to be diagnosed, and in some cases specify additional symptoms that should not be present. (See also DSM and ICD.)

Diagnostic instrument

A set of systematic procedures used to diagnose conditions like autism, for which no medical test can be applied. Diagnostic instruments involve questionnaires, observations of the person and interviews with the family (where possible). The instruments are designed such that the diagnostic criteria are applied in a standard consistent way.

Diagnostic Interview for Social and Communication Disorders (DISCO)

An interview designed for use with the parents of children or adults who are being assessed for an autism spectrum diagnosis. The interview offers a 'dimensional' framework, allowing for ‘graded’ evaluation of how closely an individual matches the criteria for a pervasive developmental disorder, as defined in the ICD and DSM systems.

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