“…The log data analysis revealed four usability issues with the PACS, compared to 48 issues that were identified in the field study. Previous usability evaluations based on log data analysis also identified modest numbers of usability issues (fourteen issues with an e-mail application [14], nine with an e-learning application [13], two with the Ryanair and Journey Planner websites [16], and one with the Skyscanner and TU/e websites [16]). However, because these studies used log data analysis as the sole method of usability evaluation, they do not provide insight into the relative effectiveness of this approach.…”