At the core, all successful businesses sell the promise of some combination of money, status, power, love, knowledge, protection, pleasure, and excit… - Josh Kaufman

Slack is tricky to manage: too much, and you're wasting time and money. Too little, and your system faces the risk of running out of the resources necessary to continue operating

Experience makes it easier to avoid Absence Blindness. Experience is valuable primarily because the expert has a larger mental database of related patterns and thus a higher chance of noticing an absence. By noticing violations of expected patterns, experienced people are more likely to get an “odd feeling” that things “aren’t quite right,” which is often enough warning to find an issue before it becomes serious.

A great example of Guiding Structure is the “Sterile Cockpit Rule” that the Federal Aviation Administration (FAA) instituted in 1981. Most airline accidents happen below ten thousand feet, where distractions can be deadly. Above ten thousand feet, pilots can talk about anything they want, but below ten thousand feet, the only discussion permitted is about information directly related to the flight in progress. By eliminating distractions, the Sterile Cockpit Rule reduces errors and accidents.