Consider all of the decision-factors when you select the instructional media. Keep the package compact, simple, and easy for the student to use. Add a bit of fun to the learning package whenever you can. Don't try to cram all of the learning needed to achieve a complete competency into one learning package. Avoid trying to design a learning package that will fit the learning style of every student in your class.
Students have individual needs.
Don't expect perfect results from your learning package without refinement or modification. Don't be discouraged with your first attempts. A competency is a broad area in which the student needs to be able to function successfully. In an occupational field, a competency would be a major task. This major task would be identified through task analysis.