## 2 Materials and Methods
### Literature Review  
The first step is a literature search, involving the identification of relevant references from two distinct research strands. The first one centers on identifying resilience maturity models (ResMMs) utilizing an SLR approach. The SLR approach was deemed an appropriate method due to its replicability, validity, and reliability features [36]. The primary objective during this phase is to categorize the literature and discern any existing gaps within the current body of knowledge. The second strand is tasked with the selection of references pertaining to resilient principles within SCM utilizing an SLNA. The SLNA allows for obtaining objective results [37] and identifying research themes and bibliometric attributes [38]. Through this analytical process, the goal is to cluster the literature, investigating dimensions and sub-dimensions. The identified dimensions and sub-dimensions are incorporated into the proposed MM, denoted as MaMoReS. To conduct the literature search, the approach of [39] was considered. The former approach is characterized by three subsequent steps: (i) planning the review, (ii) conducting the review, and (iii) reporting and dissemination. Scopus was selected as a database since it covers several relevant journals and documents [40; 41].  
Considering the review planning step, the PRISMA protocol was identified as a proper tool since it is a popular protocol for conducting SLR [42; 43; 44]. The review was carried out adopting two search queries obtained combining keyword groups and logical operators. One search is related to the SLR, while the other regards the SLNA. The 'AND' operator combines keywords from different groups, while the 'OR' operator links keywords within  
Figure 1: The three steps of the methodological framework.  
the same group. For both the strings, two groups were considered, as depicted in Table 1. Additionally, the \"' operator facilitated the identification of terms sharing a common root, while the \"' operator dictated the sequential order between multiple keywords. Both searches were conducted within the fields of title, abstract, and keywords (TITLE-ABS-KEY) in December 2023.  
The search resulted in 164 manuscripts focusing on ResMMs and 13,585 concerning resilient SCM. These documents underwent filtration based on specified criteria. These criteria are as follows:  
* Subject Area: \"Engineering\", \"Business, Management, and Accounting\", and \"Decision Science\";
* Publication from the year 2000 onwards;
* Document type: article and conference paper;
* Language: English.  
Reviews were excluded since most of them cite articles that are already present in the SLNA literature search. Furthermore, the main aim was to study individual MMs. Employing the SLR approach, the remaining manuscripts were screened to select those pertinent to the development, validation, and application of MMs concerning resiliency practices. The screening involved an initial assessment of the title, abstract, and keywords, followed by a comprehensive analysis of the full text. Manuscripts unrelated to the concept of supply chain or resilience were discarded. Similarly, manuscripts that did not propose a maturity-based model were also excluded. This led to 12 pertaining documents, while three more documents were added through cross-referencing. Thus, a total of 15 documents were deemed relevant for in-depth analysis to investigate the primary ResMMs.  
On the other hand, the SLNA methodology involved a less detailed screening process, resulting in the selection of 6474 sources for further analysis. Partial results obtained from each search query are shown in Figure 2.  
The third step of the SLR is described in the next section since it is related to the content analysis.