Use technology as a tool. Students should learn how to use the application without being aware of it. It is a means to an end, not an end in and of itself. The technology supports the instructional objective in a meaningful way. It enhances it and possibly facilitates additional beneficial outcomes not directly measured.
Technology tends to be the focus of the lesson.
Technology intrudes into the lesson or becomes the activity itself, e.g., teaching students how to use a spreadsheet. If students hate to write, they will hate to write as much using a computer as they do without it. The activity must be engage and motivate. Activity is interesting and engaging for the target population. It is fun, even goofy enough to motivate students to do whatever it takes to accomplish it and would want to do it again.