Study Designs for PICOsOnline version Match the study design that would provide the strongest evidence for a particular type of PICO question. by Anita Mitchell 1 Assessment PICO 2 Descriptive PICO 3 Intervention PICO Psychometric Studies Reliability Studies Sensitivity Studies Specificity Studies Validity Studies Correlational Statistics Surveys Qualitative Studies Observational Studies Studies of Relationships, Regression Analysis Incidence/Prevalence Studies Randomized Controlled Trials Pretest-Posttest Studies Factorial Studies Time-Series Studies Nonrandomized controlled trials