Research over the past three decades have demonstrated that even though organisations may have the requisite diversity in their midst, the employees may not feel that all the strands of their social identities may be appreciated and included – hence, leaving them feeling excluded. Unfortunately, there are not many available tools for organizations to gauge such desired levels of inclusion. Our research sets out to establish the psychometric development and the validity of the ten dimensions of one such tool, and provide rigorous, statistical evidence for its ability to establish whether an organisation has indeed engendered an inclusive environment for its employees. The dimensions are: senior managers, immediate manager, values, recruitment, promotion/progression & development, fitting in, bullying/harassment, dialogue, organisational belonging, and emotional well-being. The overall measurement within the ten dimensions provides and index, which gives organisations an indication of where their diversity and inclusion practices are failing, and where resources and effort are needed to be applied to achieve the necessary change.