The Head Toes Knees Shoulders task (Ponitz et al., 2008) will be used to assess general executive functioning skills among children aged 54 - 66 months. The assessment contains two sections, part one being easier and part two more challenging. Child participants may receive 0 to 20 points for each section. Scores will be presented separately for each section. Higher scores reflect better outcomes.

Direct assessment examining inhibitory control skills among children aged 54 - 66 months using the Knock and Tap assessment (Molfese et al., 2010). Total score is the sum across 16 items (range: 0-16 points). Higher scores reflect better outcomes.

Direct assessment examining inhibitory control skills among children aged 54 - 66 months using the Peg Tap assessment (range: 0-16 points) (Molfese et al., 2010). Total score is the sum across 16 items. Higher scores reflect better outcomes.

Direct assessment of cognitive flexibility skills among children aged 54 - 66 months, using the Dimensional Change Card Sort (DCCS) (Carlson, 2005). Participants are requested to sort cards at 3 levels. In the "separated" level, the cards depict a black silhouette shape (e.g., rabbit or boat) on a colored card. Thus, the shape and color dimensions are separated. In the "integrated" level, the shape and color are integrated on the card (i.e., red rabbit and blue boat). During "switch trials," participants must change the dimension being matched. In the "border" level, the integrated pictures from the previous level are used, but half of the cards have borders. Five subscores will be examined: Total number correct trials on the separated level, pre- and post-switch (0-6 points each); total number correct trials on the integrated level, pre- and post-switch (0-6 points each); and total correct on the border version (0-12 points). Higher scores reflect better outcomes.

Direct assessment to examine working memory skills of youth using the Backward Word Span task (Davis et al., 1995). The participant's score reflects the longest sequence for which two series were repeated correctly, plus 0.5 if one longer series was also correctly processed (range: 0 - 6 points). Higher scores reflect better outcomes.

Direct assessment to examine working memory capacity of youth using the Corsi Block-tapping Test (Kessels et al., 2000). Participants will be administered two tests: a forward and a backward test. A score will be awarded for each test, reflecting the longest sequence for which two series were repeated correctly, plus 0.5 if one longer series was also correctly processed (range for each: 0 - 7 points). Higher scores reflect better outcomes

Direct assessment to examine inhibitory control skills of youth using the Number Stroop Effect (Stroop, 1935). Points are summed across 20 items to calculate the overall sum score (range: 0-20 points). Higher scores reflect better outcomes.

Direct assessment to examine cognitive flexibility skills of youth using the Trail Making Task (TMT) (Lezak, 1995; Reitan & Wolfson, 1993). Scores reflect the time for completion in seconds, with the maximum time limit being 300 seconds (range: 0-300). Lower scores indicate a better outcome.

Self-reported questionnaire developed for study context which includes items examining aspects of professional and personal development pertaining to autonomy, self-efficacy, self-esteem, professional growth and aspirations. This does not include a standardized scale.

Youth self-reported depressive symptoms using the Self Reporting Questionnaire 20-item (SRQ-20). Items are summed for a total score of depressive symptoms over the last 30 days (range: 0 - 20 points). Higher scores reflect poor outcomes.

Classroom quality assessed using the Measure of Early Learning Environments (MELE) module of the Measuring Early Learning Quality and Outcomes (MELQO) tool.