**3. Materials and Methods**

A systematic literature review was conducted to provide an overview of the research to date related to influences of Industry 4.0 revolution on the human capital development and consumer behavior. This systematic literature review is based on Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) (http://prisma-statement.org/), being prepared following the points in the report for systematic reviews and meta-analyses [41,42].

Systematic Literature Review (SLR) is a method used to identify, evaluate, and synthesize the current situation of specific research topics in the specialized literature. This technique involves localization, restrictive collection, rigorous scientific methodological analysis, and eliminating the subjective element. The purpose of SLR is building an overview, adequately documented on a specific topic and providing a correct summary of the literature, resulting in an estimate of the overall effect for a study population [43]. The systematic review is becoming increasingly important in social science research. The scientific importance of SLR comes from its emphasis on systematically identifying and collecting all available information on a specific topic. Based on this information, it is possible to determine a certain tendency specific to the theme or domain studied. In a SLR targeting research in the field of social sciences, according to [44], the high degree of variability in the studies related to the social sciences area must be considered.

Our approach to conducting this review was based on Snyder's approach [45] and consisted of four stages: (1) designing the review, (2) conducting the review, (3) analysis, and (4) writing up the review.

#### *3.1. Information Source Search Strategy, and Identification*

A detailed strategy was developed for using the Web of Science database. A search for publications addressing Industry 4.0-related concepts, as well as human capital and consumer behavior, was conducted in February-March of 2020. The Web of Science database was selected due to its broad coverage. In addition, we performed a partial search of gray literature in Google Scholar. The last search in all databases was performed on March 2, 2020.

Regarding the search for information in articles, we have included only the open access sources because of budgetary constraints. In the first search, including articles that are not open access, 2204 titles were provided. Only 762 were maintained in the analysis, satisfying the open-access condition. This could be a limitation of the research.

Figure 1 shows the initial search yielded a total of 762 records; however, 355 records were excluded due to their document type and language. We excluded conference proceedings, book series, books, and other publications. Only journal articles were included in the systematic literature review, aiming at high-quality studies ensured by the peer-review process undertaken by academic journals. Additionally, we excluded articles written in other languages than English, thus eliminating 27 records in various other languages. Besides that, we considered only open access articles, considering the necessity of studying the entire articles. The excluded publications were organized by criterion of exclusion.

The reasons for exclusion were:


**Figure 1.** Flowchart of search and selection criteria. Source: Authors own design based on PRISMA.

#### *3.2. Inclusion and Exclusion Criteria*

The following combination of terms used to search references using Boolean operators was performed:

TI = (Industry 4.0\* OR Industry 4.0 Revolution\* OR Industrial Internet of Things\* OR Internet of Things\* OR Digitalization\* OR Cyber-Physical Production Systems\* OR Automation\* OR Information Technology\* OR Artificial Intelligence\* OR Communication Technology\*)

TS = (Human Capital Development\* OR Human Resources\* OR Labor market\* OR Labor market\* OR Consumer Behavior\* OR Consumer Behavior\*).

Figure 1 shows in detail the inclusion and exclusion criteria. The inclusion and exclusion process were prepared in accordance with the items of the PRISMA flow diagram and the Checklist. In the qualitative analysis, first, we screened the abstracts; 49 records were excluded because they provided no approach of the related to Influences of Industry 4.0 Revolution on the Human Capital Development and Consumer Behavior. Posteriorly, we proceeded to read the articles.
