- Product management involves planning, forecasting, production, and marketing of products throughout their lifecycle. There are different approaches like waterfall, agile, 6 sigma, and lean. - Waterfall is sequential while agile is iterative. 6 sigma focuses on eliminating defects and lean supports continuous improvement. The approaches each have pros and cons for different types of projects. - Case studies demonstrate successfully applying agile at a logistics company, 6 sigma at a manufacturer, and the importance of MVP in a fitness portal project.