Mary wants to stop spending money on daily coffee at Starbucks and instead save $150 per month for a family vacation. She develops a plan to replace this habit by making coffee at home, addressing potential obstacles like running late or driving by Starbucks. Mary makes incremental changes like starting with smaller savings amounts. She also identifies triggers for her coffee buying habit and substitutes alternative thoughts. Though she has some setbacks, within a few months Mary is able to purchase an espresso machine as a reward and take her family on the vacation.