A review of belongingness as a construct is vital, as even after three decades the concept has been described as "broad, vague and under-theorised" (Ward, 2022). A precise and shared understanding of belongingness will facilitate the operationalisation of the construct as an entity distinct from the outcomes and antecedents with which it is closely related. This in turn may facilitate the refinement of both belongingness-centred theoretical perspectives and practical interventions. This study, therefore, will develop a new measure of belongingness and will examine the main predictors and outcomes of belongingness in work settings.