Purpose: The purpose of this study is to describe how to internally validate the belief factors of residents' behavioral characteristics of cultural tourist activities for SEM analysis. Methodology: Quantitative information was gathered from 392 randomly chosen respondents from the Southern Tourist Circuit's Iringa, Mbeya, Njombe, and Ruvuma regions using the theoretical framework of TPB. Multivariate regression and the Pearson Correlation test were used to analyse the data in SPSS version 21 in order to validate the belief indicators. Findings: The findings show that nine behavioral beliefs (BB), four normative injunctive beliefs (NIB), three normative descriptive beliefs (NDB), and ten control beliefs (CB) meet the significance level (p-value˂ 0.05), variance inflation factor-VIF, (˂3.3), and correlation coefficients ranging between 0.3 and 0.7. In order to forecast residents' intention to engage in cultural tourism activities, the results suggest that the belief variables are suitable for structural modelling as formative indicators of their respective TPB constructs. Research Implication: By offering theoretical methods that can be used to validate belief indicators that have been qualitatively examined under the TPB before, the research adds to the body of literature on cultural tourism. Practical Implication: The study identifies areas in which policymakers could focus when creating behavioral intervention programs to improve residents' belief descriptors, ensuring that the majority of locals participate directly in the tourism industry by engaging in cultural tourism activities. Research Limitation: The study's findings have limited generalizability to the southern tourist circuit.