## 3 Results and Discussion  
In industrial practice, TPM solutions are most often implemented through the use of paper documentation or digital forms, to which access is limited. The task of the tested application is not only to facilitate access from the office to the online inspection database, without the need to check all inspection books, but also to enter additional data, e.g., in the form of photographic documentation. Thanks to this, it is possible to monitor the status of technical inspections of machines and production equipment throughout the enterprise from one place to a greater extent than before. The TPM application as an element of the advanced e-Lean system, which can be implemented in manufacturing enterprises without restrictions, applies to the machine park and users with different levels of access to data. Implementation of the e-Lean system consists of adding relevant data to the system from the point of view of maintaining the machine park in production readiness regarding, for example, machines and devices for which any control points can be defined and users who can be given appropriate roles in the system in accordance with their competences and level of access to data adequate for their function in the company and others. The application installed on the server can be accessed from stationary and mobile devices (PCs, smartphones, tablets) located in offices, as well as from the mobile devices of production employees. Figure 4 shows a screenshot of the computer screen showing the license information for the system. There is a system toolbar (Figure 4, item 1) that includes the functionality of the system. Below, you can see data regarding the server's ID and license activity status (Figure 4, item 2), as well as server settings (Figure 4, item 3) such as server address (Figure 4, item 4), account login from which notifications are sent (Figure 4, item 5), server port (Figure 4, item 6), the encryption used for communication with the server (Figure 4, item 7), and the e-mail address to be used when sending notifications (Figure 4, item 8). Figure 5 through Figure 6 show the functionality of the TPM application regarding its users and their characteristics. Figure 3: Principle of operation of the e-Lean system. Figure 5 shows a screenshot from a mobile device (this time) in the form of a tab that allows you to add new users by entering data such as name, e-mail, password, and the role assigned in the system, as well as the position in the company. Figure 4: A screenshot of the TPM application showing the system’s license data. Figure 5: Screenshot of the TPM application from a mobile device showing a user being added. The screenshot in Figure 6 shows the list of registered users, which, in addition to the username (Figure 6, item 1), includes e-mail addresses (Figure 6, item 2), position (Figure 6, item 3), and assigned role in the system (Figure 6, item 4). In addition, there are function fields on the right side labelled as Operations (Figure 6, item 5), which, after clicking, allow you to view details about individual users, e.g., in terms of reports. The TPM application primarily contains functionality related to the maintenance of machinery and production equipment, which helps to improve production efficiency. The characteristics of the machinery and equipment must be entered into the system, and the control points must then be defined (Figure 7) and pre-defined checks systematically carried out according to the plan (Figure 8). Figure 7 presents screenshots of application tabs showing defined checkpoints with their characteristics, e.g., ID, name of the checkpoint, number of places to be verified, weight, execution time, and the role of the employee in the system (Figure 7, item 1), as well as a description concerning the performance of control activities (Figure 7, item 2).