Assignment Directions: Write a short paper describing the history and differences between Six Sigma, Waterfall, Agile, and Scrum models. Understanding these models can give you a good idea of how diverse and interesting IT development projects can be. Describe what the rationale for them is and describe their key features. Describe the history behind their development.

Assignment Guidelines:
Search the web for information on these topics and describe where they are most effectively used. The length of the paper should be at least 400 words and should include all three models, their basic definitions, for what kind of projects they are used, and their limitations or drawbacks.

The business cycle is the periodic but irregular up-and-down movement in economic activity, measured by fluctuations in real gross domestic product (gdp) and other macroeconomic variables. a business cycle is typically characterized by four phases—recession, recovery, growth, and decline—that repeat themselves over time. economists note, however, that complete business cycles vary in length. the duration of business cycles can be anywhere from about two to twelve years, with most cycles averaging six years in length. some business analysts use the business cycle model and terminology to study and explain fluctuations in business inventory and other individual elements of corporate operations. but the term "business cycle" is still primarily associated with larger (industry-wide, regional, national, or even international) business trends.