To observe is neither to analyze nor to blame.
The challenge: to describe in 1 sentence (only 1) the concrete observation that has drawn our attention.
An observation without judgement, nor accusation or complaint (see an example in the following point).
To avoid: offering your opinion on the reasons why things aren't working.
Avoid the "you are"/"you're not"
We do not offer feedback on the personality or the character of
our co-worker but rather on his work and on his way of performing it.
To avoid therefore: adjectives ("you're not autonomous enough") which we will have difficulty agreeing on.
To employ: the objective description of actions ("you ask several times a day for my approval of...")
We choose to describe rather than to interpret!
Formulate a clear request
The goal of feedback: to prompt a step towards the amelioration of something which is a problem.
We must therefore ask ourselves what we expect, in order then to
express it with precision: "what would make me say, concretely, that
there has been initial progress or that that problem has
been resolved?" Here again, concrete facts and concision are
required, to give us a chance of being heard.