I've been asked to write feedback for one of my colleagues. While most of it is positive, I do have some points I want to make regarding his professionalism which I feel he could benefit from (given this is only his first year after university).

The problem is, more than concrete 'incorrect' behaviours, my impression of his unprofessionalism comes from a number of minor moments when I found myself cringing at something he did. Some examples include him stepping in a conversation when the meeting chair was talking with our client or forgetting for the n-th time what work he should report on in a daily stand-up even though he could have brought in some notes (and being relaxed and joking about it - think "Ha ha seems like I've forgotten the bug number again!").

I feel silly bringing any of those up as they not only seem minor but also not-concrete and quite subjective. Furthermore, this being in the UK, in no social occasion would minor transgressions be pointed out directly (people tend to just ignore them here or give very vague hints something is wrong). Being reasonably new to office life (one year in) I have no idea if this should be any different in professional life.