Ключевые слова: boost, carrot and stick, catalyst, cause, challenge, determinant, drive, driving force, encouragement, fillip, goad, goal, ground, grounds, impetus, impulse, impulsion, incentive, incitation, incitement, inducement, influence, inspiration, instigation, momentum, motivating force, motivation, motivational, motive, passion, persuasion, pressure, prompt, provocation, purpose, push, rationale, reason, shot in the arm, spur, stimulant, stimulation, stimulus, success, urge, urging, yeast,