Ключевые слова: assessment, best, brain, care, choice, client, concept, customer, depression, emotion, endorphin, evaluation, excellent, expression, face, feedback, feeling, good, hand, happiness, happy, head, health, healthy, hormones, lifestyle, marketing, mental, mental health, mood, motivation, people, positive, psychology, quality, rating, result, review, satisfaction, service, smile, survey, test, therapy,