This study was an initial psychometric investigation of the Universal Behavior Screener (UBS), a nine-item screening measure developed by psychologists within the Hawai'i Department of Education (HIDOE) to identify elementary school youth at risk for social, emotional, and behavioral concerns. Data from nine teachers reporting on 230 students at one HIDOE elementary school were used to examine the UBS factor structure, reliability, convergent validity, and concurrent and predictive criterion-related validity in relation to the Behavior Intervention Monitoring Assessment System, 2 (BIMAS-2). Results from exploratory factor analysis supported a two-factor structure for the UBS (i.e., Social/Emotional Engagement and Academic Readiness). Reliability analyses suggested adequate internal consistency and test-retest reliability of UBS Total and subscale scores. Findings from validity analyses were mixed. Significant correlations were found between UBS and BIMAS-2 subscales in expected patterns. However, both UBS subscales related most strongly to BIMAS-2 Cognitive/Attention and Academic Functioning subscales, contrary to hypotheses. Concurrent criterion-related validity analyses found stronger sensitivity values for hypothesized UBS and BIMAS-2 subscale comparisons; however, no UBS subscale was found to reach an adequate level of sensitivity (i.e., > 75%) in classifying students scoring in the at-risk range on any BIMAS-2 subscale. Sensitivity estimates were considerably worse for predicting short-term future BIMAS-2 subscale at-risk status compared to concurrent validity values. However, specificity and negative predictive values for all UBS and BIMAS-2 subscale comparisons were similarly high (i.e., > 0.75) for both concurrent and predictive analyses. Implications of findings from this initial examination of the UBS are discussed along with directions for further psychometric investigations of the measure. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]