LAUSR

BACKGROUND The German Biobank Alliance (GBA) aims to establish a cross-site biobank network. For this endeavor, the so-called Sample Locator has been developed ‒ a federated search-tool for biospecimens and related data ‒ forming the heart of its IT infrastructure. OBJECTIVE To ensure the sustainable use of such a tool, we included researchers as participants in an end user based usability evaluation. METHODS To develop a prototype ready for evaluation, we needed input from GBA IT experts. Thus, we conducted a two-day workshop with eight GBA IT team members. Focus was on the respective steps of a user-centered design process. With the acquired knowledge, the participants designed low fidelity mockups. The main ideas of these mockups were discussed, extracted and summarized into a comprehensive prototype using MS PowerPoint. Furthermore, we created a questionnaire concerning the usability of the prototype including the System Usability Score (SUS), questions on negative/ positive aspects, and typical tasks to be fulfilled with the tool. Subsequently, the prototype was pre-tested on basis of this questionnaire with researchers having biobank background. Based on this preliminary work, the usability analysis was ultimately carried out with researchers and the results were evaluated. RESULTS Altogether 27 researchers familiar with sample requests evaluated the prototype. The analysis of the feedback certifies a good usability given the Sample Locator prototype was seen as intuitive and user-friendly, by 74% of the participants. The total SUS score of 25 persons that completed the questionnaire is 80.4, indicating good system usability. Still, the evaluation provided useful advice on optimization potential, e.g. by offering a help function. CONCLUSIONS The findings of this usability analysis indicate that the considerations regarding a user-friendly application, which have been made in the development process so far, strongly coincide with the perception of the study participants. Nevertheless, it was important to engage prospective end users to ensure that the previous development is going in the desired direction and that the Sample Locator will be used in the future. The user comments and suggestions for improvement will be considered in upcoming iterations for refinement. CLINICALTRIAL