The term "lesson" has been used loosely to describe a collection of activities that develop student understanding around a particular set of concepts. It does not imply that this set of activities could be completed within one class. The number of minutes considered to make up one class period varies with individual school timetables. In addition, experience in co-operative learning, language level and group dynamics can all affect the amount of time needed to complete these activities. The teacher is the best judge of these factors.

The resource had been designed so that teachers can select single activities, a group of activities that form one "lesson" or a set of lessons for integration within a course. The grade levels of the material vary from Grade 10 to 12, but many activities could be modified to accommodate multiple grades.

Variations have been included within each lesson to provide alternate methodologies for lesson delivery or additional options for classroom use, and stimulus materials can always be used in a variety of ways.