Plain English Meaning
It is the answer to the question, 'Why bother writing a lesson plan at all?' The lesson plan exists so the instructor knows exactly what to teach, in what order, and how to tell whether the student actually learned it.
Full Definition
The reason a written lesson plan exists: to give the instructor an organized, written guide that ensures each training session has clear objectives, follows a logical sequence, makes efficient use of time, and produces consistent learning outcomes for the student.
Context Anchor
Seen in flight instructor training, lesson preparation, and FAA guidance on how instructors organize ground and flight lessons.
Why Pilots Care
A well-purposed lesson plan reduces training gaps that could lead to incomplete understanding and later safety issues in flight.