Teaching given at one time with primary instructor.
Task or set of tasks requiring certain effort, done in a group or individually, e.g.: worksheet.
Activity requiring manual dexterity or artistic skill, e.g.: finger knitting.
Test of knowledge given to the student.
An outing or trip to study something at first hand, e.g.: visit to a museum.
Co-op activity, whether it be organized around academics, social time, the arts, activities, crafts, service work, or projects -- or some combination of these.
A course of instruction provided by someone other than the non-primary instructor, e.g.: Outschool class, gymnastics class, karate class.