Three influential frameworks dominate modern habit science. Charles Duhigg, a Pulitzer Prize-winning journalist, wrote "The Power of Habit" in 2012 and popularized the habit loop concept. He explored how habits work in individuals, organizations, and societies, and emphasized the importance of keystone habits that trigger a cascade of other positive changes. His Golden Rule of Habit Change states that you cannot extinguish a bad habit; you can only change the routine while keeping the same cue and reward.
James Clear, author of "Atomic Habits" (2018), argues that small, incremental improvements of about 1% each day compound into remarkable results over time. He introduced the Four Laws of Behavior Change, organized around cue, craving, response, and reward. Clear also introduced identity-based habits, which focus on who you wish to become rather than what you want to achieve, and the related concept that you do not rise to the level of your goals but fall to the level of your systems.
BJ Fogg, a Stanford behavior scientist, developed the Tiny Habits method, which focuses on starting with extremely small behaviors anchored to existing routines and reinforced through celebration. Fogg's Behavior Model states that behavior occurs when Motivation, Ability, and a Prompt converge at the same moment, often summarized as \( B = MAP \). Each framework offers a slightly different lens on the same underlying process, and together they provide a rich toolkit for both understanding and changing behavior.