The chapter discusses the importance of goal intentions and the challenges they pose in achieving desired outcomes. It highlights that merely holding a strong goal intention does not guarantee success, as people often face self-regulatory problems during goal striving. The authors propose that forming implementation intentions, which specify when, where, and how to initiate goal-directed behavior, can facilitate goal achievement. Meta-analyses of 94 independent tests show that implementation intentions have a medium-to-large positive effect on goal attainment. These intentions enhance the accessibility of opportunities, automate goal-directed responses, and help shield ongoing goal pursuit from unwanted influences. The chapter also explores the component processes of implementation intentions, including increased sensitivity to critical situations and the automaticity of goal-directed responses. Finally, it outlines future research directions to further understand and enhance goal achievement through implementation intentions.The chapter discusses the importance of goal intentions and the challenges they pose in achieving desired outcomes. It highlights that merely holding a strong goal intention does not guarantee success, as people often face self-regulatory problems during goal striving. The authors propose that forming implementation intentions, which specify when, where, and how to initiate goal-directed behavior, can facilitate goal achievement. Meta-analyses of 94 independent tests show that implementation intentions have a medium-to-large positive effect on goal attainment. These intentions enhance the accessibility of opportunities, automate goal-directed responses, and help shield ongoing goal pursuit from unwanted influences. The chapter also explores the component processes of implementation intentions, including increased sensitivity to critical situations and the automaticity of goal-directed responses. Finally, it outlines future research directions to further understand and enhance goal achievement through implementation intentions.