## 2 Data and Methods  
The PROMETHE II method requires data for measuring the criteria of the alternatives. The weight values indicate if maximizing or minimizing criterion or minimum or maximum criteria values are to be considered. The company under investigation, K-plyn Ltd., Cekanice, Tabor, Czech Republic, has been seeking a tender for purchasing (a) new van(s) for its assembly workers. The company specializes in installing heat pumps, air conditioning, and solar panels, as well as inspecting gas facilities and installing and maintaining solid-fuel and gas boilers. Assembly workers use vans to transport materials, tools, and large and heavy assembly units, including large boilers, air cleaners, and heat pumps. However, first of all, it was necessary to address the ethical considerations related to the survey and data collection process in this study, as they play a crucial factor in terms of ensuring transparency, respect for participants' rights, and the integrity of the research findings. Although the survey was conducted predominantly internally within the K-plyn Ltd. company by interviewing key expert team members, it is important to note that the process adhered to ethical guidelines for research involving human participants. To ensure voluntary participation and informed consent, all respondents were provided with a clear explanation of the study's purpose, the role of their input, and how their responses would be used exclusively for the vehicle selection decision-making process. They were assured that their personal opinions and preferences would remain confidential and anonymized. Furthermore, it should be noted that prior to conducting the survey, ethical approval for the data collection process was required from the relevant corporate board to ensure compliance with best practices in research ethics. These considerations are vital to maintain the credibility of the research and to ensure that the company's decision-making process is conducted with full respect for the rights and welfare of the individuals involved. Thus, subsequently, the expert team, encompassing both internal as well as external members, has identified the top six determining factors (i.e., utmost relevant criteria set) for the van purchase as follows [65]:  
* mileage on a full recharge;
* load-carrying capacity;
* recharging speed up to 80% of the battery capacity;
* purchase price;
* load-bearing capacity;
* electricity consumption. Based on these criteria (i.e., relevant parameters to be taken into consideration in the decision-making process and meticulously evaluated), the expert team has also identified the potentially suitable vehicles (i.e., variants in this matter) for the decision-making process, out of which the ideal/compromise option will then be selected--see their description below as well as Table 1 along with the relevant data corresponding to the identified criteria above. Individual vehicle variants are taken into consideration as follows:  
* Ford E-Transit L4H2--Electric motor with power of 135 kW or 198 kW, a range up to 309 km. Cargo space 15.1 m\({}^{3}\), available in various lengths and heights of the body. Charging: 0-100% in 8 h (AC), 80% in 34 min (DC), 10 min of charging adds 78 km of range. Consumption can be reduced by 10% with economy mode. Battery warranty: 8 years/160,000 km. Standard equipment: heated windshield and mirrors, touchscreen, and air conditioning. Optional features: rain sensors, parking assistant, cruise control, and active safety systems (lane-keeping assistant, collision detection). * Renault Master E-Tech L3H2--Electric motor with a real range of 204 km, at least 80 km in extreme conditions (city traffic, maximum load). Cargo space 13 m\({}^{3}\), payload 1664 kg. In the L3 variant, it can carry up to 4 Euro pallets. Charging: 80% in 120 min (AC), full charge in 7 h. It does not support fast charging. Suitable for shorter city routes with frequent stops. * VW E-Crafter--Electric motor with a range of 173 km, primarily designed for city traffic.