The objective is to select an approate point for a forced landing, glide to that point while attempting to troubluleshoot, and instill in the pilot the knowledge that almost any terrain can be considered "suitable" for a survivable forced landing if the pilot knows how to use the airplane structure for self-protection and the protection of passengers.
AFH Ch-17 Pages 2-5 Emergency Landings
Cessna SOPM 2-68 Emergency Approach and Landing (Simulated)
Private Pilot ACS Page 51 Task B. Emergency Approach and Landing (Simulated)