## 5 Research Model and Methodology  
To assess and identify the most relevant factors for effective implementation of the CRISS platform, we used the D&M IS Success Model [12; 13]. It is one of the most cited models [40]. It serves as a reference point for many other models that tried to encompass the information system (IS) success or effectiveness (e.g., [41; 42; 43]). The D&M IS Success Model and the IS theory can be applied here because the CRISS platform is an information system. The platform utilizes processes and procedures for DC acquisition, evaluation, and certification as defined in the validated CRISS DC Framework [38]. Moreover, it involves people (teachers and students), equipment, and other related software for online learning and collaboration. The authors of the D&M Model identified six components or constructs of IS success: System Quality, Information Quality, Service Quality, System Use, User Satisfaction, and Net Impacts. Each of them is described very briefly in the next section by paraphrasing the original authors [12,13]. System Quality measures the desirable technical characteristics of IS. Since this dimension captures the system itself, it is oriented toward technical specifications such as data processing capabilities, response time, ease of use, system reliability, and sophistication. Information Quality includes the desirable characteristics of system output in the form of information such as its relevance, understandability, accuracy, completeness, usability, and importance. Service Quality measures the quality of support that system users receive from the IS department and the IT support personnel. System Use indicates the degree and manner in which staff and customers utilize the capabilities of an IS. At the same time, User Satisfaction measures users' satisfaction with reports, platforms, and support services. Finally, the extent to which the IS contributes to the success of individuals, groups, and other stakeholders is represented as Net Impacts. It measures the system's outcomes and is inevitably compared to its purpose. For this reason, the Net Impacts construct \"will be the most contextual dependent and varied of the six D&M Model success dimensions\" [13] (p. 59). The authors of the D&M Model suggest that constructs and related measures should be systematically selected. This should be done considering contextual contingencies (such as the organization's size or structure, technology, and individual characteristics of the system) to develop a comprehensive measurement model and instrument for a particular context. Therefore, to detect factors that influence the successful implementation of a DC system (RQ1) and analyze their relationships (RQ2), we proposed the research model with hypotheses as indicated in the D&M Model [13] (see Figure 1):  
**Hypothesis 1 (H1). **_The quality of the CRISS platform positively affects its use._  
**Hypothesis 2 (H2). **_The quality of the CRISS platform positively affects user satisfaction with it._  
**Hypothesis 3 (H3). **_The information quality produced by the CRISS platform positively affects its use._  
**Hypothesis 4 (H4). **_The information quality produced by the CRISS platform positively affects user satisfaction with it._  
**Hypothesis 5 (H5). **_The service quality positively affects the use of the CRISS platform._  
**Hypothesis 6 (H6). **_The service quality positively affects user satisfaction with the CRISS platform._  
**Hypothesis 7 (H7). **_The use of the CRISS platform positively affects its net impacts._  
**Hypothesis 8 (H8). **_The use of the CRISS platform positively affects user satisfaction._  
**Hypothesis 9 (H9). **_User satisfaction positively affects the net impacts of the CRISS platform._This study adopted a quantitative methodology. Data were collected via survey and administered to primary and secondary teachers to achieve previously proposed research aims.