How does Porter’s competitive forces model help companies develop competitive strategies using information systems?

1.    Define Porter’s competitive forces model and explain how it works.
2.    Describe what the competitive forces model explains about competitive advantage.
3.    List and describe four competitive strategies enabled by information systems that firms can pursue.
4.    Describe how information systems can support each of these competitive strategies and give examples.
5.    Explain why aligning IT with business objectives is essential for strategic use of systems.