Detailed planning helps humans follow steps and makes them more likely to complete a process and achieve a goal. The more concrete a plan, the better. One specific type of planning is called mental contrasting implementation intentions (MCII). That’s when in addition to planning steps towards a goal, an individual plans what could go wrong, the hurdles they could face, and pre-plans ways to overcome them.
To encourage someone to complete an action or a process, have them plan out the action steps.
Have the person plan out "If X happens, then I will do Y" statements. This creates concrete steps for them to follow, so they already have a plan to overcome a hurdle instead of getting derailed from an action plan.
Instead of having someone commit to getting a vaccine, have them select a specific day and time to make that action more concrete in their mind.
