The full chain, link by link
A complete chain has six segments: (1) vulnerability factors in the 24 hours before — sleep, food, substances, conflict, hormones; (2) the prompting event, in observable terms — 'my boss emailed at 4:47pm with a re-do request'; (3) the chain of links between event and behavior — thoughts ('she thinks I'm incompetent'), body ('chest tightened, throat closed'), urges ('drink, leave, hide'), actions ('walked to the kitchen'); (4) the target behavior in concrete terms; (5) immediate consequences — relief, shame, retaliation; (6) delayed consequences — hangover, partner conflict, missed deadline. Every link is a potential intervention point.
Finding the modifiable link, not all the links
New DBT clinicians try to intervene on every link, which exhausts the client and produces no change. The discipline is to pick one link — usually the earliest one the client can reliably notice — and build the skill there. 'Could you have used STOP at the moment your chest tightened?' is more useful than 'How could you have prevented your boss from emailing?' The link you target should pass three tests: the client can notice it in real time, the client has (or can build) a skill for it, and intervening there would have changed the chain.
Solution analysis — the half of chain analysis people skip
Chain analysis without solution analysis becomes a guilt tour. After the chain, walk back through it and at each major link, generate one alternative behavior and rehearse it. For the prompting event: how could the client have reduced vulnerability? For the link with the strongest urge: which DBT skill applies (TIP, STOP, opposite action)? For the link just before the behavior: what would 'one minute of urge surfing' have looked like? End the session with a written plan for the next chain — not the next month.