Implementation Intentions is a plan you make beforehand about when and where to act. That is, how you intend to implement a particular habit.
Implementation Intentions is a self-regulatory strategy popularized by psychologist Peter Gollwitzer in his 1999 research paper: Implementation intentions: Strong effects of Simple Plans 1 Gollwitzer observed when that people encounter problems in translating their goals into action (e.g., failing to get started, becoming distracted, or falling into bad habits), they may strategically call on automatic processes in an attempt to secure goal attainment. This can be achieved by plans in the form of implementation intentions that link anticipated critical situations to goal-directed responses (“Whenever situation x arises, I will initiate the goal-directed response y!”). Implementation intentions delegate the control of goal-directed responses to anticipated situational cues, which (when actually encountered) elicit these responses automatically.