## 2 Systematic Analysis Methodology
#### PRISMA-Compliant Systematic Review with LLM-Enhanced Methodology
\begin{table}
\begin{tabular}{c c c c} \hline \hline
**Item** & **Methodological Stage** & **Relevant PRISMA 2020 Items** & **Location in Manuscript** \\ \hline
1. & **Define Research Scope:** Establish research questions, objectives, and domain & & \\  & focus (_full detection, machine learning, predictive untitramunc_). & & 3 (Rationale), 4 (Objectives) & Section 1 (Introduction) \\ \hline
2. & **Design Search Strategy:** Use predefined search terms (“fault detection” AND \"machine learning\" AND \"Predictive maintenance\") and logical operators & 6 (Information sources), 7 (Search strategy) & Section 2 (Methodology) \\ \hline
3. & **Specify Data Sources:** Select high-impact, multidisciplinary databases (Scopus, W6). & 6 (Databases, Registers) & _Sources of Information_ \\ \hline
4. & **Apply Inclusion Criteria:** Years: 2015-2025, Language: English; QI-Q2 journals & & \\  & or indexed conference proceedings; 5-5 citations; Direct mining/industrial applications. & 5 (Eligibility Criteria) & _Inclusion Criteria_ \\ \hline
5. & **Apply Exclusion Criteria:** Restricted-access articles; Non-English publications; & & \\  & Duplicate documents. & 5 (Eligibility Criteria) & _Exclusion Criteria_ \\ \hline
6. & **Merge and Clean Documents** Consoliate, remove duplicates, and verify & 8 (Selection process), 16a (Study selection) & _Merge and Clean Documents_ \\ \hline
7. & **NLP-Assisted Thematic Analysis:** Apply advanced NLP and bibliometric techniques to identify recurring terms, latent patterns, and emerging themes. & 9 (Data collection), 10b (Other variables), & _Thematic Analysis: NLP +_ \\ \hline
8. & **Expert Validation:** Combine automated clustering with domain-expert insights to refine and declaraily themes, ensuring contextual accuracy. & 9 (Data collection), 10b (Other variables) & _Thematic Analysis: NLP +_ \\ \hline
9. & **Hybrid Review and Final Inclusion:** Adopt NLP-based ranking and manual & 8 (Selection process), 16a (Study selection) & _Full Review and Inclusion_ \\  & expert screening for quality control and dataset alignment. & & \\ \hline
10. & **Quantitative Synthesis:** Use bibliometric methods (e.g., histograms, individual studies), 20 (Results of & _Quantitative Analysis: Insights Through_ \\  & co-occurrence networks) to identify topic trends, collaborations, and research gaps. & & \\  & & syntheses) & _Visualizations_ \\ \hline
11. & **Qualitative Synthesis:** Perform a descriptive review of the most relevant documents, grouped by key themes (e.g., sustainability, IoT, digital twins). & 13 (Synthesis methods), 19 (Results of & _Qualitative Analysis:_ \\  & & individual studies), 20) (Results of & _Descriptive Review of Key Findings_ \\ \hline
12. & **Flow Diagram:** Illustrate the workflow (search \(\rightarrow\) validation \(\rightarrow\) synthesis) in a dedicated figure. & 16a (Study selection), 16b (Excluded & _Studies_) \\  & & studies) & & \\ \hline
13. & **Meta-Synthesis and Recommendations:** Converge findings into practical recommendations, discussing future research directions and industrial relevance. & 23 (Discussion), 24 (Registration and & End of Qualitative Analysis + \\  & & protocol) & Section 5 (Discussion) \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Improved Systematic Analysis Checklist, showing alignment with PRISMA 2020. Each item corresponds to a specific methodological stage (middle column), its relevant PRISMA 2020 items (middle-right column), and its location in the manuscript (right column). specialized procedure is outlined, consisting of multiple sub-steps, including unsupervised topic modeling, iterative expert validation, and final thematic consolidation. The process begins with the compilation of a corpus of documents, including all relevant studies based on predefined inclusion criteria. Then, NLP preprocessing is applied, involving tokenization and lemmatization to prepare the data for analysis. Next, topic modeling and term extraction techniques are used to identify key themes within the documents.