*2.2. Material*

The design of this study was a retrospective case study. The material for this study was based on a total of 144 documents from 11 full-scale underground mining exercises as well as documentation from 16 collaboration meetings; Figure 2 shows a timeline of the full-scale exercises and collaboration meetings. The individuals participating in the collaboration meetings were the same individuals planning, executing, and evaluating the exercises. The full-scale exercise participants' perspectives were included within the exercise organizers' evaluations of the full-scale exercises. After each exercise, the exercise participants were asked to reflect on the exercise and to come up with suggestions for further improvements.

**Figure 2.** Timeline of collaboration meetings (C) and full-scale exercises (E).

The documentation from the full-scale exercises included a total of 106 documents about planning, logbooks, observation protocols, and evaluations. All of the organizations contributed with material during the full-scale exercises as follows: the rescue service, 30 documents; EMS, 24 documents; the mining companies, 14 documents; the training company, 10 documents; and Umeå University, 28 documents. The full-scale exercises were carried out from April 2015 to October 2018. The collaboration meetings were carried out between January 2017 and December 2018 and resulted in a total of 38 documents. These documents were, for example, documentation of what was discussed during the collaboration meetings.
