This helps developers learn whether the application is successful at achieving its goals and objectives, and is performed after the implementation of the application. Design types are grouped according to level of quality of evidence as classified by the U.S. Preventive Services Task Force and the Canadian Task Force on the Periodic Health Exam. Guide to clinical preventive services . I. Randomized controlled trials . Experiments in which potential users are randomly assigned to use the application or to a control group.
Randomization promotes comparability between groups.
Greater blinding lessens the chance of bias. Non-randomized controlled trials . For this type of design, specify how the participants were recruited, selected, and assigned to the groups and how the groups compare similarities and differences between users and non-users prior to the evaluation. An evaluation of users with no comparison or control group. Multiple time series .