Children's participation in age-appropriate activities is critical to their overall well-being. Neurodevelopmental disorders cause motor, cognitive, communication, and behavioural problems. Children have restrictions in their ability to participate and engage in activities because of these problems. Children with neurodevelopmental disorders require more parental care and are less likely to participate in activities at home, school, and in the community than their healthy peers. This highlights the significance of evaluating activity restrictions and participation limitations. Our study aims to demonstrate the reliability and validity of the Turkish version of the Activity Scales for Kids (ASK), which assesses children's participation and activity in their daily lives at home, school, and play, as well as cultural sensitivity.

Participation in activities is an essential component of maintaining health. The International Classification of Functioning- Child and Youth (ICF-CY) framework includes several components that can be used to determine activity and participation. These components are defined by two terms: capacity and performance. Both capacity and performance are basically measures of capability, even if the performance qualifier is intended as a measure of participation. Performance describes what a person does in their current setting. The current environment brings with it a social context. As a result, performance determines how involved an individual is in his or her living environment and life experience. The ability to do a task or action is known as capacity, which denotes the highest functional level that may be achieved at any moment and in every setting. Capacity is measured in a consistent or standard setting. Therefore, it reflects the individually adjusted ability of the individual. The child's physical and social environment has an impact on their capacity. For instance, while the child can stand up on his own in a standardized clinical setting, he might not be able to do the same after falling during physical exercise in a school context or in public.

According to the ICF-CY, disability is not only related to body structure and function but also to activity constraints and participation restrictions in various situations. An objective assessment demonstrates how performance has changed over time and encourages children to enhance their own abilities. These examinations need to meet psychometric standards before being used with children. In addition, the results of research studies provide useful information about the natural developmental steps expected, especially in childhood disability subgroups. There isn't a valid and reliable scale in Turkish literature that assesses children's capacity and performance in activities at home, school, and in play environments. The goals of our research are to demonstrate the reliability and validity of the ASK, a tool that assesses children's participation and activity levels at play, school, and at home. Families and medical professionals will be guided by this scale.

Inclusion Criteria:

• Age between 5 years and 15 years;
• Diagnosed with neurodevelopmental disorders.
• To have the cognitive ability to answer questions for assessment.
• Completing the test-retest assessment.
• To be able to read and speak Turkish

Exclusion Criteria:

• Patients with unmanageable psychological disorders (schizophrenia, bipolar disorder, major depressive disorder) would be excluded from the study.

children who have diagnosed neurodevelopment disorders