The article examines the existing approaches for assessing the effectiveness of time management at the enterprise; their advantages and disadvantages are given. The essence and features of individual (personal), role (professional), and team time management were considered, and their main characteristics were compared. Influence factors for assessing the level of time management efficiency at the enterprise are formulated, which consider the productivity of working time, the organisation of the workspace, and economic indicators. Based on the formulated factors, a model was developed for assessing the enterprise's time management level based on the theory of fuzzy sets. A hierarchical classification of influencing factors on the enterprise's time management efficiency level is provided. The algorithm of the process of describing the level of efficiency of time management at the enterprise is presented, which includes the phase of fuzzification, i.e., the transformation of the values of the output variables into linguistic variables with the help of membership functions, the development of fuzzy rules that connect the linguistic variables, and the phase of defuzzification, which involves the transition from fuzzy values of quantities to specific parameters. All influencing factors are described as linguistic variables that affect the enterprise’s time management efficiency level. They are expressed with the help of fuzzy terms defined on the corresponding universal sets and evaluated with the help of fuzzy terms. Membership functions for the linguistic variable “level of communication and feedback in the organisation” are presented. A fuzzy matrix of knowledge was built, considering the introduced qualitative terms for assessing the enterprise's time management efficiency level. Based on the constructed knowledge matrices, fuzzy logical equations were formed for all factors influencing the level of time management efficiency, which describe the degree of belonging of the variables to the corresponding terms. The hierarchical system of logical equations evaluates the degree of propriety of the predicted indicator of the management decision regarding the level of time management efficiency at the enterprise.