Definition
Constructive feedback is information about an observed behaviour or outcome, framed so the recipient can act on it. It has four properties: it is specific (names the exact behaviour, not a generalisation), descriptive (states what happened, not who they are), timely (delivered close enough to the event to be remembered), and actionable (the recipient can do something different next time).
The distinction from criticism is structural. Criticism delivers a verdict on the person; feedback delivers information about a behaviour. Verdicts invite defence; information invites adjustment. Constructive feedback is the disciplined translation of "you are sloppy" into "the section on X had three factual errors that this checklist would have caught."
Why it matters
How it works
A working feedback delivery has four moves. Anchor — start with the relationship and the goal, not the error. Describe — name the specific behaviour and its observable impact, without character commentary. Invite — ask the recipient how they see it, before you offer your interpretation. Forward — agree on what changes next time, with the recipient owning the change.
The hardest part is the invite step. Most feedback-givers skip it because they want to deliver their conclusions; the recipients hear the skipped step as being lectured at rather than reasoned with. The two-minute pause for the recipient's view typically doubles the feedback's effectiveness.