Previous considerations on the theory of the efficiency of small enterprises in the literature have not led to the creation of a comprehensive model. This is due to the ambiguity of the concept of efficiency and the lack of consistency in the subject matter. In the traditional approach, the efficiency measures needed to be improved for managing small organisations that compete in a turbulent environment. The measures included in the literature mainly refer to financial issues, whereas to a minimal extent, they refer to the future efficiency of the organisation. Therefore, the need to organise the problems raised in theoretical and research areas was indicated. This study aims to create a dynamic model of efficiency in a small enterprise. Quantitative analysis based on a representative sample of 455 organisations allowed the verification of the hypotheses, resulting in a comprehensive model of the efficiency of small enterprises. The empirical model coincided with the conceptual model. The model was validated on a sample of 336 service companies. On this basis, the company's efficiency occurs in a continuous cycle of its elements: economic efficiency, manufacturing efficiency, and effectiveness.