When I first started to write my own exercises, I learned two simple but important steps the hard way. In this short, 5-minute video, I describe what happened when I did NOT include the two steps in a couple of exercise and how I was able to improve them.
Also, see • Recommended Treasure Chest for Writing Your Own ESL Materials
Here is the link to the video:
Writing Your Own Exercises: Two Recommendations
Just these two steps improved not how I was able to not only do my job but also how well students were able to complete the exercises and apply the concepts.