This is a great question, and I am currently experiencing that in my current position. Most of the time, projects that are given the GO decision are executed till commercialization. Most of these projects are usually well planned, budgeted and executed. However, due to unforeseen circumstances, the organization may decide that pursuing such project may impact the organization reputation or it may not bring profits to the organizations. Therefore, in many of these instances the project gets “shelfed” which means that all the work in that project ceases until these circumstances are removed. Once these circumstances are removed, the organization will again pursue the project in full speed. In my example, the company had a project shelfed for almost 4 years because the market was not evolved enough to receive such an advanced technology. Therefore, the company decided to halt the work on that project until further notice. Recently, I was brough on that project to carry on what others have started. Most of the time, the organization will not decide to pursue a project if that project is against the organization mission, corporate strategy or it will not bring enough revenue to the organization.