## 2 Materials and Methods
### Extracting the Influencing Factors Using a Literature Review  
#### 2.3.1 Preparation and Application of the Systematic Review Method  
One of the objectives of analyzing the related papers (Section 1, the part on related studies) was to obtain some pointers to carry out PRISMA. We analyzed the search words and search strategies used in the related studies. The search words and words related to the papers' results were collected. Then, we selected our search words based on our research interests. We selected 33 search words to be searched on Scopus, Web of Science, and IEEE Xplore. Our 33 search words can be divided into 3 groups: topic, focus, and context, similar to [35]. The topic group covered team communication, divided into synonyms of \"team\" and similar words of \"communication\". The theories and methods that are useful to analyze team communication were contained in the focus group. The context group contained the environmental constraints, i.e., emergency. We decided not to limit our search to the NPP domain to assist in preparing for our next research on finding applicable methods from other domains. After trial searches, we moved some search words from the topic to the context category (team performance, team cognition, and team-based problems) because significant reviews on general team communication were not obtained. The search words socio-technical and complex decision-making were also moved to the context group for the same reason. We also examined the search strategy used in the related works, which is the steps taken to collect the papers from the database to obtain the most relevant papers and reduce the sorting effort. The simplest search strategy is to enter all the search words at once on the search bar of the database, such as that used by [24]. The search words can also be added gradually after analyzing the search results [23]. Entering multiple search words at once applies the \"and\" logical relationship; this approach has a drawback when we want to include synonym words or obtain general yet helpful papers that do not contain all the search words in their title and abstract. The authors of [29] prepared a different set of search words for each database and [31] added this search strategy with steps for search queries per database. The steps of the search queries were the additions of search words with a similar concept combined using the \"or\" (logical) relation, and each group of similar search words was combined with the \"and\" relation [23]. This search strategy solved the previously mentioned drawback because similar words (synonyms or similar concepts) can be grouped, and papers mentioning at least one word from the group can be obtained. However, the analysts have to decide on the number of search word groups and the number of words to be included in a group. Too many groups or words in a group would yield many papers and slow down the selection process, but the contrary might fail to obtain related papers. Our search strategy was as follows: the search words in a group were linked using \"or\" and the groups were linked to each other using the \"and\" relation, similar to [36]. Using this search strategy, we were able to collect the papers that match our research interest, namely,  
Figure 1: Research method used to develop the influencing factors of team communication in NPP emergencies. team communication, focusing on cognitive systems engineering-related theories, in the context of emergencies or general team performance-related studies in socio-technical systems (Table 1). We also added the following conditions: papers written in English excluding books, book chapters, graduate theses, posters, presentations, abstracts only, and white papers. Next, we proceeded to screen each paper. Upon reading the title and abstract, we excluded the papers that (1) neither analyzed a team nor an emergency, (2) considered an emergency but not at the team level, (3) analyzed a team but not during an emergency, and (4) was not a research paper.