For effective and transparent business management, organisations must comply with legal requirements in all interactions with stakeholders and other entities involved in business operations. This study aims to explore the criteria for selecting legal consulting services in businesses listed on the Stock Exchange of Thailand and to develop a structural equation model. The research utilised a mixed-methods approach, integrating qualitative in-depth interviews with quantitative methods. The findings identified the guidelines for selecting legal consulting services to maximise benefits for the industrial business sector, ranking the four components in order of importance based on their highest average values as follows: 1) Cooperation, 2) Consultant Characteristics, 3) Value and Benefit, and 4) External Environment. Hypothesis testing revealed a significant difference between the two business groups at the 0.05 level. The analysis of the developed structural equation model demonstrated consistency with the data, meeting evaluation criteria and aligning with empirical findings. The model's results indicated a Chi-Square Probability (CMIN–p) of 0.171, a Relative Chi-Square (CMIN/DF) of 1.093, a Goodness-of-Fit Index (GFI) of 0.962, and a Root Mean Square Error of Approximation (RMSEA) of 0.014. These findings highlight Cooperation, Consultant Characteristics, Value and Benefit, and the External Environment as the key guidelines for selecting legal consulting services in the industrial sector, with the model demonstrating significant consistency.