Attention Deficit Disorder (ADD): A severe difficulty in focusing and maintaining attention. Often leands to behavioural problems at home, education and work. Also called Attention Deficit Hyperactivity Disorder (ADHD).

Autistic Spectrum Disorder: Individuals with ASD are affected by their ability to: Understand and use non-verbal and verbal communication, interpret social behaviour, which in turn affects their ability to interact with others, and think and behave flexibly (ie. know how to adapt their behaviour to suit specific situations). Such inabilities are described as 'The Triad of Impairment'.

Brain Injury: The physical damage to brain tissue or structure that occures durign or after birth that is verified by EEG, MRI, CAT or a similar examination, rather than by observation of performance. When caused by an accident, the damage may be called Traumatic Brain Injury (TBI).

Developmental Aphasia: A severe language disorder that is presumed to be due to brain injury rather than because of developmental delay in the normal acquisition of language.

Dyscalculia: A severe difficulty in understanding and using symbols or functions needed for success in mathematics.

Dysgraphia: A severe difficulty in producing handwriting that is legible and written at an age-appropriate speed.

Dyslexia: A severe difficulty in understnding or using one or more areas of language, including listening, speaking, reading, writing and spelling.

Dysnomia: A marked difficulty in remebering names or recalling words needed for oral or written language.

Dyspraxia: A severedifficulty in performing drawing, writing, and other tasks requiring fine motor skill, or in sequencing the necessary movements.

Specific Language Disability: A severe difficulty in some aspect of listening, speaking, reading, writing or spelling, while skills in the other areas are age-approriate.

Specific Learning Disability: The term referred to difficulties in certain areas of learning.