Information Technology (IT) projects are enablers of organizational transformation and business growth. Despite the contribution of methodologies and frameworks for project management, the ratio of failed IT projects remains high; then, studying critical success factors of IT projects persist as an essential issue for researches and practitioners. This paper presents a systematic literature review focused on compiling and synthesizing project success factors in IT projects. The literature search was conducted using primary journal articles until 2017. All studies agree on the relevance of studying the critical success factors in IT projects given their particular characteristics. The results indicate there is no clear definition of project success concept; our review consolidates the IT success criteria into time, budget, project management, system quality, user satisfaction, and economic value. Also, there a vast and overlapped list of factors; so, this research proposes a structure that synthesizes the most referenced critical factors that have in common soft attributes as involvement, support, communication, and commitment. Findings reinforce the relevance of soft skills in IT project teams.