Habits and Behaviour Change

About this course

A course on changing behaviour, built around the parts of the research that are solid and honest about where the popular versions have drifted from them. Three findings get set straight early. The 21-day figure came from a surgeon's 1960 observation about patients adjusting to their appearance and had nothing to do with habits; the best-known study found a median of 66 days with a range from 18 to 254. Difficult behaviours may never fully automate, which is why "make it a habit" is poor advice for anything genuinely hard. And a single missed day had no measurable effect on eventual formation, which directly contradicts the streak framing that dominates this space and is the more useful finding, because believing one miss ruins everything is exactly what turns one miss into abandonment. Then the design of a change that survives a bad week: making it much smaller than you want to, attaching it to a routine that already happens, deciding when and where in advance, and changing the environment. That last one is the most reliably supported idea in the field and the least exciting. People with better self-control do not resist temptation more successfully; they encounter it less. The second half covers stopping something, which works differently from starting: finding the specific cue rather than the general complaint, the extinction burst that arrives just before it gets easier, and why the recovery from a lapse rather than the lapse itself determines the outcome. It is also clear about where a course is the wrong tool, particularly for alcohol and nicotine, where the effective options are better than most people expect. It ends with the long game, the drop-off that arrives between weeks three and six and presents itself as proof that this was never going to work, and what to do when a habit stops holding. Read the first lesson before anything else.

What you will learn

• Explain the habit loop, and what the research actually found about how long formation takes
• Design a change small enough to survive a bad week, with a cue that already happens
• Use environment and friction instead of relying on willpower or motivation
• Break a habit by identifying its specific cue and replacing what it was doing for you
• Recover from a lapse without abandoning the change
• Recognise the normal drop-off, and diagnose why a habit has stopped working

Before you begin

• No background in biology or medicine needed
• Nothing to buy: no supplements, devices, apps, or subscriptions
• A willingness to change one thing at a time rather than everything at once