Two-Way Door
Amazon's decision taxonomy: reversible decisions (walk back through the door) should be made fast; irreversible ones deserve deliberation. Most decisions are two-way; most process treats them as one-way.
Heard in the wild
“Vendor trial is a two-way door — just decide and adjust.”
Tone check: Professional
Genuinely useful filter. Ask 'what does reversal cost?' before scheduling the third alignment meeting.