This document provides an overview of psychological principles for persuasive technology and behavior change. It discusses foundational concepts like motivation and ability, psychological architectures that combine principles, and time-based processes of change. The key points covered include how psychological forces combine through reinforcement or contradiction; optimizing mixtures of persuasive ingredients; feedback loops for goal setting and progress; and integrating gamification mechanics with behavior change techniques. The overall aim is to understand how to design technologies that apply psychological theories and optimize influence through blended combinations of motivational factors.