The document discusses behavior change techniques used in public policy known as MINDSPACE which summarizes nine key "nudge" techniques: who communicates information influences decisions (Messenger), people avoid losses more than seek gains (Incentives), social norms strongly shape behavior (Norms), people tend to go with defaults (Defaults), novelty and relevance grab attention (Salience), subconscious cues prime decisions (Priming), emotions impact choices (Affects), public commitments are more likely to be honored (Commitments), and people act in ways that boost their ego (Ego). It also mentions a council tax pilot intervention where a company rewrote tax correspondence content.