Here's a quick and easy way to analyze how well you are applying AFL principles in your classroom:
If a parent were to ask his or her child how they were doing in your class, could the child give an accurate, detailed, and specific answer about his or her progress?
If you are regularly providing descriptive feedback to students then they should be able to tell their parents not only if they are doing well or not, but also what their strengths are, what they have mastered, and in what areas they still need improvement.
Of course, many young people - because they are young people - will tend to answer with a simple "Fine" or "I don't know". However, if we could magically control for the idiosyncracies of youth, the question remains, could your students specifically and with detail tell their parents how they are doing in your classroom?
If the answer is "No" then it probably means you are not giving enough feedback - which in turn probably means that you are not assessing them regularly enough. Or perhaps it means you need to focus on training your students to better use the feedback that you are giving.
Don't confuse a student being able to report on his or her grade with a student being able to answer the question in detail. Being able to say, "I'm making a B" is very different from being able to say, "I've mastered grammar but am having trouble with analyzing poetry."
So what can you do to give your students more descriptive feedback so that they can better answer the question?