The SARA problem-solving model involves scanning to identify problems, analyzing problems through research and developing hypotheses, assessing potential responses, and responding through intervention and evaluation. Evaluation assesses whether the response was implemented as planned and whether it caused the identified problem to decline. Impact evaluations aim to determine if the response caused the decline by looking for a plausible explanation, association between the response and decline, and whether the response preceded the change. Interrupted time series designs are superior but not always practical for evaluation. Process and impact evaluations throughout help determine if the problem declined enough to end the problem-solving effort.