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Annoying and bothersome behaviours among persons with developmental disabilities (DD) is a relatively frequent phenomenon. However, not all behaviour that is difficult to accept in its surroundings should be seen as abnormal or problem behaviour (PB). Some of these behaviours may be an expression of a person’s psychosocial needs and may be considered as adaptive and normal. The paper aims to discuss these issues.

Authors attempt to discuss relevant issues in persons with DD which have an impact on their behaviour, intending in this way to define criteria for a reliable differentiation between normal and abnormal behaviour and psychiatric disorders.

Differentiating between normal and abnormal may be a difficult task for a professional treating persons with DD because of the lack of adequate criteria for such differentiation. The problem becomes even more complex when one attempts to differentiate between PB and psychiatric disorder. By approaching the subject from a developmental perspective and by determining the level of the person’s emotional development, insight in subjective person’s experiences was achieved. On the ground of a “good practice” the authors made schemata outlining criteria for differentiation between these constructs.

The application of these schemata in the practice made it easier to establish appropriate diagnoses and was favourable for the planning of adequate treatment and support of persons with DD and mental health problems.