What does it mean that reversible versus irreversible decisions?

Spend minimal time on easily reversible decisions and maximum time on irreversible ones.

Example: You are deciding between two project management tools for your team. If you choose wrong, switching costs you a weekend of data migration and some minor frustration. Now compare that to accepting a job offer that requires relocating your family to another country, selling your house, and pulling your children from their school. Both are decisions. They demand radically different amounts of deliberation. The project management tool is a two-way door — walk through, look around, walk back if you do not like it. The relocation is a one-way door — once you have sold the house, uprooted the kids, and left the job you had, the path back does not exist in the same form. Treating these two decisions with the same level of analysis is a category error. The first deserves thirty minutes. The second deserves thirty days.

Try this: Audit the last ten decisions you spent significant time on. For each one, classify it: Was the decision reversible (you could undo it within days or weeks at low cost), partially reversible (you could undo it but with meaningful cost or friction), or irreversible (once done, the path back is closed or prohibitively expensive)? Now examine the pattern. How many of your reversible decisions received the same deliberation time as your irreversible ones? Identify one current decision you are delaying. Determine its reversibility class. If it is reversible, set a deadline of 48 hours and make it with the information you have. If it is irreversible, identify the three pieces of information that would most reduce your uncertainty, and go get them before deciding.