Abstract: The aim of this study is to define the impact of project manager’s knowledge, skills and experience on the project’s time, cost and quality, through investigating deeply in the field of project management, managers and the success of firm’s projects. The research study collected all the needed information by using a research questionnaire in the aim of analysing the research variables. The main objective of this study is to define the impact of managers on the success of projects through investigating the effects of manager’s (knowledge, skills and competencies) on the project’s (time, cost and quality). Choosing the research study variables lies on enhancing the firm’s position between competitors through exploiting the attributes of their managers and giving best results in the presence of the difficult circumstances and high competitiveness. All the needed information had been collected by using regression sample model and analysed through (SPSS).