Background: Intensive longitudinal designs support temporally granular study of processes making methods like ecological momentary assessment (EMA) increasingly common in medical and behavioral science. However, the repetitive and intensive measurement strategies associated with these designs increase participant burden which limits the breadth and precision of EMA surveys. This is particularly problematic for complex clinical phenomena, such as suicide risk, which research has shown is multidimensional and fluctuates over narrow time intervals (e.g., hours). To overcome this limitation, we proposed the Computerized Adaptive Test for Suicide Risk Pathways (CAT-SRP) which supports the simultaneous assessment of multiple empirically informed risk domains and facilitate personalized survey content. Objective: The objective of this study is to develop, calibrate, and pilot the first multidimensional computerized adaptive test for suicidal thoughts and related psychosocial risk factors in intensive longitudinal designs like EMA. Methods: A web-based assessment platform was developed to adaptively administer the CAT-SRP. CAT-SRP items were modified from existing validated instruments to support administration in intensive longitudinal designs. The item bank was developed in line with major ideation-to-action theories of suicide and consultation with experts outside the study team. Exploratory item factor analysis was used to identify dimensionality of the item bank. Item parameters were calibrated using a multidimensional graded response model in a large cross-sectional community sample (N = 1759, 36.33% with a history of suicidal thoughts). Following calibration, the CAT-SRP was evaluated in an EMA study of participants with a past month history of suicidal thoughts (N = 29 across 2,134 observations). Adaptive testing utilized D-optimal item selection, a dual variable-length stopping criterion, and MAP scoring. Descriptive statistics and mixed effects models were used to examine CAT-SRP performance (e.g., efficiency, survey overlap) and relationships among CAT-SRP domain scores. Results: The calibration study identified two suicidal thought domains (active and passive thoughts) and twelve risk factor domains: humiliation, loneliness, anger, pain, defeat, impulsivity/negative urgency, entrapment, distress tolerance, perceived burdensomeness, thwarted belongingness, aggression, and a hope/method factor. Domain information was highest between average to high levels of domain scores. Study 2 results suggested that the CAT-SRP 1) administered surveys with low to moderate item overlap, 2) incurred low participant burden, and 3) may improve near-term prediction of suicidal thoughts relative to traditional EMA measurement. Most EMA surveys reached the maximum length, 50 questions, highlighting a need to refine selection and stopping rules. Conclusions: The CAT-SRP effectively personalized EMA survey content to respondents which reduces the repetitiveness and perceived burden of intensive longitudinal research designs. Continuous domain scores from MCAT also provided more nuanced measurement, compared to traditional approaches that struggle with zero-inflation in EMA, and appeared to produce stronger predictive relationships. Overall, the CAT-SRP demonstrates strong methodological advantages to utilizing CAT for intensive longitudinal data collection.

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