Learn that person just like you would a book and keep notes.

I've got to keep note of what I'm doing here.

I would keep notes on good strategies, and poor ones.

The last weight on me has been trying to keep notes for this purpose.

Nobody with any sense kept confidential notes on a computer.

I've been keeping notes for a long time, writing them into this file.

Did you happen to keep notes of what you've seen here?

"We have kept very detailed notes over the years," he said.

The man might have kept extensive notes, but he was no fool.

It would do no harm to keep notes and file a report.