Final answer:
Self-assessment is a powerful tool in motor skill development that encourages students to assess their own skills and abilities, leading to reflection and self-control of the development process.
Step-by-step explanation:
The term for a powerful tool in motor skill development that encourages students to assess their own skills and abilities, leading to reflection and self-control of the development process is self-assessment. Self-assessment allows students to evaluate their own progress, identify areas for improvement, and set goals for further development. For example, in a physical education class, students may use self-assessment to evaluate their performance in different sports and activities, identify strengths and weaknesses, and make plans to improve their skills.