Plan between now and Quiz 2

		Mon 23	Software development: 5-step waterfall, spiral
		Wed 25	Design's unexpected impacts
		Fri 27	Agile development, refactoring, technical debt
		Mon 30	Supply chain attacks
		Wed 1	Quiz review
		Fri 3	Quiz 2
	
	Today	
	Waterfall development:

		1. Requirements
		2. Design
		3. Implementation
		4. Testing
		5. Maintenance
	
	Spiral development:

		1. Plan
		2. Risks
		3. Develop
		4. Evaluate