Rigor is good as long as it contains Slack. Slack should be built into the system, it should be part of the rigor. Because rigorous systems aren't brittle, they

Rigor is good as long as it contains Slack. Slack should be built into the system, it should be part of the rigor. Because rigorous systems aren't brittle, they are resilient. And you only get resilience when you are able to adapt to the unexpected. If your plan only works if everything goes right, you don't have a plan, you have a wish.