**4. Validation**

The main validation activities of MuseStudio are described in this section. The relevant external features of MuseStudio were evaluated by using qualitative and quantitative methods. For the evaluation of the functional and nonfunctional features of a library for supporting brain data management, such as MuseStudio, a well-known evaluation method from the software engineering field was use. Performance and latency are other important elements when brain data are collected and visualized.

First, over the years, many software engineering methodology evaluation frameworks have been published. DESMET [38] is a methodology for evaluating software engineering methods/tools by Barbara Kitchenham. DESMET can be used to compare a generic method or a method that is a specific approach within a generic method or tool. This methodology has been used in other articles for evaluation purposes [39]. According to DESMET, there are two types of evaluations:


DESMET refers to the measureable effects of using a method as quantitative or objective, while method appropriateness is referred to as qualitative, feature analysis, or subjective. Method appropriateness is accessed usually in terms of features provided by the method/tool or the training requirements. Another important consideration is how to organize the evaluation process. According to DESMET, for a qualitative evaluation, it can be organized as a survey, a case study, or a formal experiment. In qualitative screening, it can be organized as a feature screening mode, a survey, a formal experiment, or a case study. DESMET qualitative feature screening mode can be performed by a single person for a number of methods where the evaluator not only determines the features to be accessed and their rating scale, but also performs the assessment. In qualitative screening mode, the

evaluations are usually based on the literature describing the software method, rather than actually using the method.

Secondly, a latency study in MuseStudio was also conducted, and the data gathered are shown.
