Project Management in Information Technology

Concerning the project life cycle and required project management skills answer the following questions:

What major tasks occur at each of the four project phases?
What is the role of the project sponsor?
How do you determine who are project stakeholders?
What are the skills needed to be a successful project manager?
Make sure that you briefly describe why each of the listed tasks is critical to the success of the project and how each of the listed skills helps the project manager.

Concerning the relationship between the project and product life cycles, answer the following questions:

What additional phases does the product life cycle have that the project life cycle does not have?
What is the spiral model? How is the spiral model applied to the product life cycle of a set of software releases such as the Microsoft Windows family as it evolves?
How can the product life cycle stages be extended to reap more profit from a product?

Please cite sources.