The Department of Education (2016) offers brief definitions of anxiety and the types of anxiety disorders experienced in childhood and adolescents. This is also supported by the World Health Organisation (2016) and the ICD10 diagnostic tool as well as the American Psychiatric Association Diagnostic and statistical manual of mental health (DSM-5). - Anxiety is defined as an emotional disorder which has an array of symptoms including; breathlessness, fearful, irritability, panicky, fidgety, sickness, tense or having difficulty sleeping. These references will be used as a first point of call in defining and laying out the symptoms of the types of anxiety disorders experienced by adolescents and children.criticisms of diagnostic tools - mental health is a complex phenomenon in which we have relatively little understanding. The diagnostic tool is a classificatory system and Banzato (2008) states that the diagnostic categories failed to be validated and a large debate around the classifications descends around the separation of the boundaries between different disorders. This suggests that using the diagnostic tools on their own may lead to an over identification of mental health disorders, classifying behaviours that don't necessarily need to be classified will increase the diagnoses of disorders. Further criticisms as well as support of the DSM-5 has been offered by NHS England (2013) who state that there are two main interrelated criticisms, for example, during the revision process of DSM-V to the DSM-5 pharmaceutical industry had a large influence on what was to be included. In addition, the DSM-5 contributes to the medicalisation of behaviour and mood that would not necessarily have or need a diagnosis.