A few years ago I came across the methodology known as Lesson Study. It’s been used with great success in the US and Japan in the last 10-15 years and it involves a different type of observation. You can read more about it here in its original form. I will admit I have taken parts of it that I think work better than others in normal classroom situations.
In essence, the way I’ve found works best for me and the colleagues looks like this:
Key Features of Lesson Study
In pairs, teachers plan a lesson together and identify focus for lesson /learning