The self-assessment can be a powerful tool to gather formative data on a particular group/class of students. It can be used at the beginning of a lesson/unit or administered at the end. In my experience, children are pretty honest and are oftentimes "harder" on themselves when thinking about their perceived skill level/ability. Knowing how your students feel up front about a particular skill/unit will often dictate the direction the lessons you teach will take. We want to boost the confidence of our learners and that comes through well designed lessons that allow students ample time to practice the skill(s). As the physical literacy cycle states, when students develop competence in their skills/abilities, they feel more confident, and as a result, are more likely to engage in physical pursuits that require those motor skills or movement patterns!