Background: : Maintaining a balanced and diverse daily routine is one way to ease adolescents' transition to adulthood. The absence of tools that assess adolescents' daily routines led to developing the Daily Activities for Youth Opportunity (DAY-Opp) Questionnaire. This research describes the development, reliability, and validity of DAY-Opp as a clinical assessment tool of adolescents' frequency, independence, and satisfaction with daily activities. Method: : The sample of 117 typically developing adolescents (59 girls and 58 boys aged 11-19 years) divided into three age groups and completed the Hebrew version of the DAY-Opp. We statistically analyzed discriminant, concurrent, and predictive validity with the Pittsburgh Sleep Quality Index and the General Self-Efficacy Scale. Results: : As the participants' age rose, their activity frequency decreased, independence increased, and satisfaction from daily performance remained unchanged. Sleep habits and self-efficacy predicted the frequency, independence, and satisfaction in various daily routines. Conclusions: : The DAY-Opp may enable occupational therapists to map and discuss with adolescents their strengths and challenges in daily routines and, thus, improve their occupational performance, satisfaction, and well-being. Comments The authors report no potential conflicts of interest.