Over the years, I have worked with a lot of principals and their supervisors with the goal of improving the principals' instructional leadership practice. There is one issue that comes up often: Supervisors are not specific enough in telling principals what they should do to get better.
For example, a coach, supervisor or consultant might say, "You're doing a really good job with collecting evidence of classroom instruction, but an area you might focus on is the way you give feedback to teachers." And that's all they say.
As a principal getting this feedback, I don't necessarily know what I should do next. I just know I'm not doing it right.