Although the first research on the creative process was based on interviews with the aim of identifying the main stages (macro‐process), in the last 50 years researchers have focused more on the analysis of micro‐processes, i.e., the mechanisms underlying the generation of ideas. This interest in the micro‐processes is partly a result of the tools available to researchers to carry out rigorous studies on the creative process. In this article, we present a useful and relevant analytical tool for macro‐processes to assess the creative process in a natural context and when it occurs. Here, the reader will find advice on establishing a research protocol for the creative process by using diaries. Examples of diaries and results are presented. The advantage of this tool is that it enables a direct, rich, and inexpensive assessment of the creative process. Thus, the ecological validity of the diary method is particularly high.