# The Use of Mobile Applications for Sustainable Development of SMEs in the Context of Industry 4.0
## 3 Results
### Background of \"Testing\" and \"Feedback\" Stages
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline
**Criterion:** & **Value** & **Mentoring** & **Mentoring (X)** & **M-Learning** & **M-Learning (x)** & \(S_{1}^{2}\) & \(S_{2}^{2}\) & **F** \\ \hline \multirow{4}{*}{\begin{tabular}{c} The convenience of \\ perception and \\ understanding \\ \end{tabular} } & \multirow{4}{*}{0.2} & 4 & 0.8 & 4 & 0.8 & & & \\ \cline{3-8}  & & 4 & 0.8 & 4 & 0.8 & & & \\ \cline{3-8}  & & 4 & 0.8 & 5 & 1 & 0 & 0.01 & 0 \\ \cline{3-8}  & & 4 & 0.8 & 4 & 0.8 & & & \\ \cline{3-8}  & & Average & 4 & 0.8 & 4.25 & 0.85 & & & \\ \hline \multirow{4}{*}{\begin{tabular}{c} Easiness of study \\ \end{tabular} } & \multirow{4}{*}{0.2} & 5 & 1 & 4 & 0.8 & & & \\ \cline{3-8}  & & 5 & 1 & 3 & 0.6 & & & \\ \cline{3-8}  & & 5 & 1 & 3 & 0.6 & & & \\ \cline{3-8}  & & 4 & 0.8 & 4 & 0.8 & & & \\ \cline{3-8}  & & Average & 4.75 & 0.95 & 3.5 & 0.7 & & & \\ \hline \multirow{4}{*}{\begin{tabular}{c} Need for \\ additional advice \\ \end{tabular} } & \multirow{4}{*}{0.2} & 1 & 0.2 & 2 & 0.4 & & & & \\ \cline{3-8}  & & 0 & 0 & 1 & 0.2 & & & \\ \cline{3-8}  & & 2 & 0.4 & 1 & 0.2 & 0.03 & 0.013 & 2 \\ \cline{3-8}  & & 1 & 0.2 & 2 & 0.4 & & & \\ \cline{3-8}  & & Average & 1 & 0.2 & 1.5 & 0.3 & & & \\ \hline \multirow{4}{*}{\
\begin{tabular}{c} The convenience of \\ displaying \\ information \\ \end{tabular} } & \multirow{4}{*}{0.1} & 4 & 0.4 & 5 & 0.5 & & & & \\ \cline{3-8}  & & 4 & 0.4 & 4 & 0.4 & & \\ \cline{3-8}  & & 5 & 0.5 & 4 & 0.4 & & \\ \cline{3-8}  & & 4 & 0.4 & 4 & 0.4 & & \\ \cline{3-8}  & & Average & 4.25 & 0.425 & 4.25 & 0.425 & & \\ \hline \multirow{4}{*}{
\begin{tabular}{c} The quality of staff \\ training \\ \end{tabular} } & \multirow{4}{*}{0.3} & 4 & 1.2 & 5 & 1.5 & & & \\ \cline{3-8}  & & 3 & 0.9 & 5 & 1.5 & & \\ \cline{3-8}  & & 3 & 0.9 & 5 & 1.5 & & \\ \cline{3-8}  & & 3 & 0.9 & 5 & 1.5 & & \\ \cline{3-8}  & & 3.25 & 0.975 & 5 & 1.5 & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 1: F-test of expert assessment of training. Provided that (X\(\sim F(m,n)):P(X\leq F_{\infty}(m,n))=\propto\), where \(\propto=0.9\), \(n=3\), and \(m=4\) the hypothesis is confirmed, since \(\Phi\) of each parameter is less than its tabular value (5.34). Implementing training using mobile devices, the employees' level of skills in working with modern gadgets has to be considered, since not every employee can be an active user of mobile devices. The need for additional advice can be seen on the right side of the graph, line \"3\" (Figure 5) corresponding to \"The quality of staff training\" from Table 1.  
According to the experts evaluating (Figure 5), M-learning could replace hands-on learning (mentoring) because the mobile application is inherently multi-functional and able to expand the range of tasks to be performed. After an expert evaluation of the suitability of the offered application and especially its content for the investigated company, the mobile application was handed over for practical testing to a group of 50 employees in the next part of \"Testing\". After using the mobile application in the work process, selected welders evaluated the application by the Usability test [39], which is a standard test of the usability of the mobile application in practice. The system Usability Scale (SUS) is a base for the Usability test [39; 40; 41] and serves as a tool for getting feedback from users. This test is aimed at determining the level of usability, learnability, comprehensibility, and attractiveness of the target audience of product users [40]. SUS consists of 10 statements with 5 options for respondents (from strongly agree to strongly disagree) (Figure 6). The SUS evaluates a wide range of products and services, including hardware, software, mobile devices, websites, and applications [39]. The user's score for each statement is converted to a new number, added, and then multiplied by 2.5 to convert the original scores from 0-40 to 0-100. Although the scores are 0-100, they are not percentages and should only be considered in terms of their percentile ranking.