Abstract Cognitive flexibility is the ability of an individual to think in a new or different ways and reach their goal successfully without getting struck in between depending on one single way. When one have a conceptual understanding with in depth information and clarified view in any circumstances they could develop the competence to modify their thinking and behaviour to face any problem and solve them in an empathetic way. The purpose of this paper is to present a descriptive report of the process of construction and validation with consistency of the scale in measuring cognitive flexibility. The Scale on Cognitive Flexibility is developed by Rashmija and Sasikala in the year 2021. The scale was operationalized on three dimensions – Thinking, Behaviour and Environment. The content validity is established through a panel of three experts in the field of psychology, educationalist. To pilot study, the instrument was distributed among 100 Standard IX students who were randomly selected from two schools in Kanyakumari District. The responses were scored to analyse the internal consistency and establish reliability and validity. The Cronbach alpha of the tool is 0.92. Thus, a Scale on Cognitive Flexibility with internal consistency was developed.