Affiliative oriented organisational citizenship behaviour (OCB) refers to teachers' voluntary acts in exhibiting helping behaviours towards students, colleagues, and schools. This paper sets out to discuss, in detail, how this study developed the Affiliative Oriented Organisational Citizenship Behaviour Scale (AOCBS) to measure teachers' behaviour in forming OCB. In this study, a conceptual model for affiliative oriented OCB was built based on extensive literature review and served as a guideline in generating an initial set of 14 new items. Content validity was assessed by two academic supervisors and five experts in human resource, education, and psychometrics. Reviews by academic supervisors revealed three items that need to be refined to provide clarity to respondents. Furthermore, the expert review suggested removing six items due to low content validity index (CVI < 0.80). Thus, only eight items were retained as they represent the content specification. Future research is required to assess the construct validity and reliability of AOCBS, which will provide empirical evidence on the reliability and validity of this new instrument. AOCBS has the potential to measure and evaluate affiliative oriented OCB among teachers.