What does it mean that review completes the capture loop?

Captured thoughts that are never reviewed are effectively still lost. The capture habit preserves raw material; the review habit transforms it into usable knowledge. Without review, your capture system becomes a graveyard of good intentions.

Example: An engineering lead captures 50 thoughts per week in Apple Notes — product ideas, architecture concerns, things to follow up on. She's disciplined about it. After six months, she has 3,000 unprocessed notes. Opening the app produces a wall of text and a spike of anxiety. She can't find anything, can't remember why half of it mattered, and starts avoiding the app entirely. The capture happened. The thinking didn't.

Try this: Schedule a 15-minute review session sometime in the next 48 hours. When the time comes: open every capture inbox you use (notes app, voice memos, email drafts, bookmarks, Slack saved items). For each item, make one of four decisions — act on it now, archive it somewhere retrievable, develop it into a longer note, or delete it. Don't deliberate. Spend no more than 30 seconds per item. When you're done, count how many captures you'd completely forgotten about. That number is the size of the gap this lesson addresses.