The Inbox is for fast capture — when you can't stop to think.

• During a lecture, a question hits you → Inbox
• Walking home, an idea pops up → Inbox
• Mom mentions a thing you need to do → Inbox

Don't try to organize. Just capture.

Later (every few days), open the Inbox and:

• Move tasks → Assignments
• Delete ideas you no longer care about
• Check the Processed box on the rest