Keep a real “not now” list

Ideas that do not enter the portfolio should not disappear into a backlog with no rules. Record the re-entry condition:

• a data source becomes reliable;
• a process owner is assigned;
• a contract expires;
• volume reaches a stated threshold;
• a risk control exists;
• another experiment resolves a dependency.

Review the condition, not the age of the idea. Time passing does not make a weak opportunity stronger.