Anatomy of an IT project

How does software development work out in practice? What are the issues and problems that the project manager faces? Often we can understand more by exploring case studies, both of successful and failed projects. BskyB's software project is one example of a failed project. What do such projects tell us about the issues and difficulties surrounding software development?Also we can learn from successful projects. Furthermore, case studies can give us a feel for the overall nature of a software development project and the issues associated with it.

Question: Describe a case study of a software development project failure and a success. Identify the factors involved in each case. Based on these studies, supplemented by other sources, what are the principle concerns a software project manager should address?