First, the overall data is complete. The data collected in the interview is data that has not yet reached the complete test, so the data itself will have errors and deviations. This makes it always difficult to calculate correct statistics（Jim, 2020）. Moreover, the use of SPSS is also full of difficulties and challenges, and it takes a lot of time to understand and draw diagrams. This requires professional operations.
Second, some reasoning tests require users to make educated guesses to run reasoning tests, but these guesses require theoretical knowledge. There will be some uncertainties in this process（Jim, 2020）. It is difficult for personnel without professional knowledge to operate and understand SPSS well, and errors in operation result in omission of data. This leads to deviations between the information and the actual situation, resulting in unreliability of the survey results. VEGAN4EVA needs to train personnel to master the use of SPSS, or replace SPSS with other convenient software.
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