Developments within social and exact sciences take place because scientists engage in scientific practices that allow them to further expand and refine the scientific concepts within their scientific disciplines. There is disagreement among scientists as to what the essential practices are that allow scientific concepts within a scientific discipline to expand and evolve. One group looks at conceptual expansion as something that is being constrained by rational practices. Another group, however, suggests that conceptual expansion proceeds along the lines of ‘everything goes'. The goal of this paper is to test whether scientific concepts expand in a rational way within the field of organizational behaviour. We will use organizational climate and culture as examples. The essence of this study consists of two core concepts: one within organizational climate and one within organizational culture. It appears that several conceptual variations are added around these core concepts. The variations are constrained by rational scientific practices. In other terms, there is evidence that the field of organizational behaviour develops rationally.