According to (PMI 2016), $220 million was lost in 2016 due to poor project performance, a 12% increase over 2015. This is strongly related to the profile of the project pilot. The purpose of this article is to study and analyse the different styles of project management and its evolution over time, according to the vision of MIDLER 1996, which groups them into four models: Entrepreneur, Engineering, Taylorian and concurrent.Our article also gives a historical view of the project management by trying to name and characterize the major stages and to understand the main levers of development and diffusion.To do this, our research is based on a survey aimed at managers of Moroccan organizations of different sizes, this work enabled us to implement the project management style most adopted by project managers and to define the criteria for choosing the most appointed project managers. Finally, our article investigated the impact of the health crisis on the economic activity of these organizations and on how to manage projects during the pandemic period.