Professor Econsmart teaches a course in principles of economics at a large university. In the current semester the professor intends to add new techniques to the standard lecture format he employs. Some of these techniques include asking students to prepare a topic at home and present it in class;

using simulations and games to illustrate specific issues and ideas; employing social media; assigning group work and projects; inviting guest lecturers; and brainstorming. Most of these ancillary teaching techniques are not on the weekly teaching itinerary but are interspersed throughout the course duration in staggered intervals. Why would Professor Econsmart use these ancillary teaching methods in this interspersed manner?