A Principal's Reflections: Questions to Guide a Reflective Conversation on Learning @E_Sheninger | Moodle and Web 2.0 | Scoop.it
Most educators desire meaningful feedback that can be used as a catalyst for growth. When it comes to improving learning, criticism will rarely, if ever at all, lead to changes to professional practice. Here is the main difference between the two:
Feedback - information about reactions to a product, a person's performance of a task, etc., used as a basis for improvement.

Criticism - the expression of disapproval of someone or something based on perceived faults or mistakes.

Via John Evans, juandoming