Why write the plan down?
Plans in chats or heads disappear. New team members have no context. A written plan (diagrams, schemas, API contracts, sequencing) is shareable, reviewable, and survives team changes.
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More FAQs in Common Mistakes in Project Planning (and How to Avoid Them)
No clear goal, no feature breakdown, no prioritization, no schema design, no HLD or LLD, ignoring dependencies, no estimates, no feedback, treating the plan as fixed, and no write-up.
Without a clear goal, scope creeps in and the team has no focus. A one-sentence goal anchors every feature decision. If you cannot say what the app does in one sentence, you do not understand it.
Tag each feature as Must Have, Should Have, or Nice to Have. The MVP includes only Must Have features. Without prioritization, you build everything at once and ship nothing.
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