I had some time thinking about feedback; and those who read my writings more regularly would see that I’ve previously championed “giving and receiving feedback” as key skills to be taught in schools.
And it probably take a lifetime to properly master this because both giving and receiving feedback are really hard. Most people can go on defensive when you offer to give some feedback. And the praise sandwich is kind of yucky an approach for some to adopt. There are those who advocate “giving advice” instead.
One of the best way for behavioural change is actually to ask the person who needs improvement for advice on the problem you observed. Surprisingly most people knows the solution to overcoming their weaknesses. So once they discover that they actually have certain problems they’ll get to work fixing it.
Either way I think a large part of the equation is also on receiving feedback; how we are able to process feedback and deal with it matters. That’s why I personally like the approach of making it an encouragement rather than a feedback. An encouragement toward particular aspiration. That way, it is not something you lack but more about moving towards a destination.