## 2 Research Methodology  
A systematic literature review [12] aims to systematically analyze the published evidence to answer specific research questions, using an objective and replicable search strategy. According to [PERSON] et al. [13], the systematic literature review process should go through the following steps: (1) identification of the focus of review, research and mapping of available evidence; (2) specification of the question to be answered by the review; (3) identification of the studies that will be included in the review; (4) data extraction and evaluation of the quality of the studies performed; (5) development of the synthesis; (6) communication of the results of the analysis and dissemination. The process referred to by [PERSON] et al. [13] is aligned with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) recommendations [14] and the current work will follow both. Considering the first steps referred to by [PERSON] et al. [13], the objective of this research was used as the driver for the identification of the following themes as the main ones for this study:  
* Fundamental concepts about Industry 4.0 and Business Process Engineering, acting mainly as a conceptual context for the entire article. * Existing generic and specific maturity models. * The process of building specific maturity models and evaluation instruments. * Researching qualitative and quantitative methods of research, as a way to identify factors to support the process of developing surveys for specific maturity models. The first screening of these themes allowed the identification of the context, research gap, and objective, as stated in the introduction. Moreover, the questions that this literature review aims at answering are the following:  
1. What are the main differences among maturity models described in the literature? 2. Which factors should be adopted for selection or development of a maturity model? Having defined the overall context of the study and the research questions allowed the following of the process recommended by the PRISMA Statement [14], including the following four main steps, as adapted to this study (Figure 1): (1) identify records through database searching and other sources; (2) screen and exclude records; (3) assess full-text articles for eligibility; and (4) include studies for qualitative. The bibliography software package Zotero was used as the reference manager system. For the identification of papers to be analyzed, three databases were used: Emerald Insight, JSTOR, and SciELO. Papers were searched using the following terms:  
* \"Fourth Industrial Revolution\" OR \"Industry 4.0\" OR \"Smart Manufacturing\". * (\"Business Process Management\" OR \"Business Process Reengineering\" OR \"Organizational Architecture\") AND (\"Maturity Model\" OR \"Maturity Assessment\" OR \"Readiness Assessment\"). The search results were filtered in order to include only articles published in scientific journals, in the English language, from the year 2000 onwards, and belonging to the Business, Engineering, Management and Organizational Behavior, Science and Technology Studies. Removing duplicate records resulted in 1220 papers as a starting point. After screening the title and abstracts considering the research themes mentioned above, there were more than 900 papers excluded. The remaining 268 articles were analyzed and 208 were excluded because they did not allow to respond to the objectives of this article. A typical example of excluded articles are papers with too narrow and specific areas that would not add relevant information for the objective of the current article. After that, 60 papers were selected for a full text qualitative analysis. As surveys are particularly relevant for the development of maturity models, 7 key references were included to support the identification of factors for the Development of Generic and Specific Maturity Models for Industry 4.0.