The ADDIE Model (Analyze, Design, Develop, Implement, and Evaluate) is the tried and true standard for creating effective instructional material.
ADDIE is a process, a sequence of steps. Within each step, a collection of guidance and principles that, when employed properly, lead to the successful development of the subject instructional materials.
How that guidance and those principles are brought to bear is a matter of experience And experience is the way you avoid time and budget wasting instructional design conundrums akin to pounding square pegs into round holes.
The following link connects you to Glenner "GRACE Model" for Dementia Care produced for the George G. Glenner Alzheimer's Family Centers, Inc.