# A Review of Industry 4.0 Assessment Instruments for Digital Transformation
## 3 Results
### Analysis and Findings of the Key Research Studies
\begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline
**\# Paper** & **Spec** & **Occure** & **Assessment Tool** & **Methodology** & **Validation** & **Drivers** & **Dimensions** & **Industry** & **Objective** & **Contribution** \\
**Supplementary** & **Supplementary** & **Article** & **Method** & **Method** & **Drivers** & **Dimensions** & **Industry** & **Objective** & **Contribution** \\ \hline
33 & Framework & No & Qualitative & LR & \begin{tabular}{c} Telecommunication \\ technology; people, platform, persons, \\ device, station, work \\ unit, enterprise and \\ connected world. \\ \end{tabular} & \begin{tabular}{c} Hierarchical and \\ device, station, work \\ unit, enterprise and \\ system and \\ \end{tabular} & \begin{tabular}{c} Oil and gas \\ industry. \\ \end{tabular} & \
\begin{tabular}{c} To develop a \\ readiness \\ framework of \\ framework of \\ mobile C in the \\ upstream and and \\ gas industry. \\ \end{tabular} &
\begin{tabular}{c} Oil and gas industry \\ are assessed accurately, \\ Prokids flexibility in \\ the adoption stages. \\ \end{tabular} \\ \hline
34 & Framework & No & Empirical & CS & \begin{tabular}{c} E-government, \\ collaborative \\ platforms, software, \\ data protection, data \\ sharing, digital \\ infrastructure, cloud \\ \end{tabular} & \begin{tabular}{c} E-govermano, \\ relationships, and \\ activities. \\ \end{tabular} & Agriculture, & \
\begin{tabular}{c} To outline a \\ operationalize the \\ group-physical \\ system with the \\ innovation \\ \end{tabular} &
\begin{tabular}{c} Prokids insights on \\ the multifaceted \\ impacts of \\ digitalization. \\ \end{tabular} \\ \hline
35 & Framework and & No & \begin{tabular}{c} Review \\ Measurement \\ \end{tabular} & CS & NA & \begin{tabular}{c} Business models \\ and products; \\ market and sales; \\ value chains \\ and operations; it infrastructure; legal \\ and security; \\ organization and \\ strategies. \\ \end{tabular} & Manufacturing & \
\begin{tabular}{c} Coluate the \\ readiness and \\ constraints of \\ transparency levels \\ \end{tabular} &
\begin{tabular}{c} The questionnaire \\ constraints of the \\ gathering of the \\ definition of adherent \\ or not adherent \\ each one of the RAMI \\ and 12 standards. \\ \end{tabular} \\ \hline
36 & Framework & No & \begin{tabular}{c} Review \\ conceptual \\ paper \\ \end{tabular} & LR & \begin{tabular}{c} RAMI 4.0, Standards \\ 14.0 Ontology: \\ \end{tabular} & \
\begin{tabular}{c} Hierarchy level, \\ lifecycle and value \\ stream, layers. \\ \end{tabular} & Manufacturing &
\begin{tabular}{c} Calculate the \\ readiness and \\ constraints of the \\ gathering of the \\ definition of adherent \\ or not adherent \\ each one of the RAMI \\ and 12 standards. \\ \end{tabular} \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Conf. Table 2 shows the categorization of assessment instruments in terms of maturity models, roadmaps, frameworks, readiness assessments, questionnaires, surveys and/or checklists. These outcomes are helpful given the type of assessment instrument that could be further developed after this research. Overall, 14 out of the 36 papers included a survey, questionnaire, or checklist, while 5 out of the 16 did not show all the questions or are not available at all. This is an important factor because there is a clear need for accessible tools that help assess companies in their digital transformation and Industry 4.0 implementation. Papers presenting a full questionnaire are described as follows. [PERSON] et al. [22] propose an assessment model that focuses on small and medium-sized enterprises. The model includes 46 questions that tackle different areas such as strategy, people, processes, technology, and integration. In addition, the model evaluates technologies such as information technology infrastructure, data analytics and security, Internet of Things and cyber-physical systems, automation, and robotics, among others. It also emphasizes investment plans for certain Industry 4.0 concepts.