Here is a great overview of what Instructional Design is in less than 5 minute by Joel Gardner on YouTube. It explains the principles very well.
Dee Fink is the Director of the Instructional Development Program at University of Oklahoma, or he was when he wrote a book called: “Creating Significant Learning Experiences: An Integrated Approach to Designing College Courses”
He also wrote short guide for instructors on how to design courses. It is called: ” A Self-Directed Guide to Designing Courses for Significant Learning” and it is available here: http://www.deefinkandassociates.com/GuidetoCourseDesignAug05.pdf for download.
This is an excellent resource to help faculty who could use a guide on how to design their courses or just their assessments even. It is a quick read. We use it quite a bit.