Timing:

• 00:00-00:50 introduction (may skip)
• 00:50-04:15 overview
• 04:15-11:40 astronomy lesson: the quantum discontinuity (may skip)
• 11:40-18:20 open and closed
• 18:20-20:40 feasibility of open-closed principle
• 20:40-42:45 accounting system example
• 42:45-46:55 the lie
• 46:55-52:12 two solutions
• 52:10-56:15 agile design in practice
• 56:15-57:25 reprise
• 57:25-1:02:17 summary/credits