Start with the definition from a book edited by Snyder and Lopez in 2002:
"Positive psychology extends the field of psychology from focus on disease, weakness, and damage to the study of strength and virtue…
Psychology is not just about illness or health; it also is about work, education, insight , love, growth, and play. And in this quest for what is best, positive psychology does not rely on wishful thinking, self-deception, or hand waving; instead, it tries to adapt what is best in the scientific method to the unique problems that human behavior presents in all its complexity”
Read What We Talk About When We Talk about Positive Psychology by Reb Rebele, a MAPP alumnus who has served as an instructor in the program for many years. The same publication includes a short piece by Ryan Niemiec titled Mindfulness and Character Strengths: Advancing Psychology to the Next Level.
Listen to Martin Seligman talk about what makes life worth living. Martin Seligman is one of the founders of the MAPP program.
MAPPsters have contributed to the collected information on positive psychology by writing books, blogs, articles, and capstone papers.