What does it mean that externalize feedback you receive?

Feedback you only hear once is feedback you will distort, remember selectively, or forget entirely.

Example: Your manager tells you in a 1:1 that your technical communication is strong but your cross-team coordination needs work. Two weeks later, you remember only that she 'said something about communication' — and you can't recall whether it was praise or criticism. You've lost the signal. If you had written it down within the hour — date, source, exact words, your emotional reaction, and the specific behavior referenced — you'd have a data point you could act on, track over time, and cross-reference against future feedback.

Try this: For the next seven days, carry a feedback log (digital note, physical notebook, or dedicated document). Every time someone gives you feedback — formal or informal, positive or negative, verbal or written — capture it within 60 minutes using five fields: (1) Date, (2) Source, (3) What they said (as close to verbatim as possible), (4) Your emotional reaction in the moment, (5) The specific behavior or output they referenced. At the end of the week, read all entries in sequence. Look for patterns: Do multiple sources reference the same behavior? Does your emotional reaction correlate with the feedback's usefulness? Which entries surprise you on re-reading?