The traditional project coaching takes place mostly in a number of face-to-face coaching sessions. However, under conditions of time pressure in IT projects, a physical presence of coaches could form a bottleneck. These facts led to the idea of using Internet technologies to support  the project coaching. The benefits of the web based project coaching  reside in the ubiquitous availability of coaches. To enable the web coaching, a flexible support platform is required. The elaboration of requirements, design, implementation and evaluation of such a platform is the goal of this dissertation. The elaborated concept was applied and evaluated in real IT projects. The numerous findings and implications could be gained on the empirical basis.