Strategic communication is a complex concept that requires an analytical and comprehensive approach, and includes a detailed evaluation of each step in the communication process. Strategic communication is often directly perceived as communication that follows the mission, vision and values of the organization, and each carefully planned step in this process works in accordance with organizational goals. An important part of strategic communication are the evaluation models of strategic communication, which presuppose the development of each step in the process, and enable the final findings to be implemented in further communication activities. By doing so, we encourage constant improvement and easier planning of future communication activities. In this thesis I have focused on the GCS model of strategic communication evaluation, implemented in 2016 by the Government Communication Service of Great Britain. The model represents the good practice of evaluation, on the basis of which I have also built the empirical part of the thesis. The empirical part represents an analysis of the case study of strategic communication in accordance with the GCS model of evaluation of communication activities of the Advocate of the Principle of Equality, which was in Slovenia established in 2016, and as a newly established independent state body follows the mission of promoting equality and preventing discrimination.