## 2 Materials and Methods  
In this study, a systematic literature review (SLR) approach, which provides a more thorough and structured overview of the literature compared to a descriptive review, has been adopted. SRL is an effective approach for identifying new research opportunities within a specific field by analyzing and synthesizing existing published works. The SRL developed focused on the digital building logbook concept in order to find information about this tool in the construction sector. The search focused on results, articles, and publications that contain key terms relevant to the research objective in their titles, abstracts,and author keywords. To simplify and make clear the process of the literature review, a research protocol was defined (Table 1). Scopus and Web of Science databases were utilized to conduct the study in order to guarantee that a sufficient amount of research regarding the use of logbooks in the construction sector was collected and evaluated. These two databases were chosen since they are both global and multidisciplinary platforms for accessing research literature. The time-frame established spanned from 2010 to 2024 to identify the publications related to building logbook implementation from the initial insights regarding the AECO field's use of this tool. A comprehensive search was carried out under the \"Article title/Abstract/Keyword\" field with the search string consisting of three parts. The first part investigated the tool of interest and comprised keywords related to \"Building Logbook\", \"Logbook\", \"Passport\", \"Building Passport\", or \"Digital Building Logbook\". The second part aimed to specify the context of analysis and involved keywords such as \"AECO\", \"AEC\", \"Construction\", or \"Building\". Lastly, the third part considered the domain of facility management and relevant keywords related to \"Facilit\", \"FM\", or \"Facilit\" management\". The literature analysis was carried out according to the outlined methodology and led to the results shown in the PRISMA diagram in Figure 1[21]. \begin{table}
\begin{tabular}{p{142.3 pt} p{284.5 pt}} \hline
**Item** & **Content** \\ \hline Aim & \\ \hline Key objective & To examine the current studies on building logbook implementation in the AECO sector with special attention given to the in-use phase of the building lifecycle \\ \hline Research questions & \\ \hline Main question & What is the status of the building logbook and the state of the art of the AECO field? \\ \hline Sub question & What types of data are typically stored in a digital building logbook? \\  & How does the digital building logbook support the building’s entire lifecycle? \\  & To what extent does the digital building logbook impact facility management? \\ \hline Search methods & \\ \hline Web-based platform & Scopus, Web of Science \\ \hline Filters & \\ \hline Keywords & ((“Building Logbook” OR “Logbook” OR “Passport” OR “Building Passport” OR “Digital Building Logbook”) AND (“AECO” OR “AEC” OR “Construction” OR “Building”) AND (“Facilit” OR “FM” OR “Facilit” management”)) \\ \hline Year of publication & 2010–2024 \\ \hline Type of publication & Articles, books, book chapters, conference papers \\ \hline Idiom & English \\ \hline Exclusion criteria & \\ \hline  & Not related to the digital building logbook \\ \hline  & Outside the time period \\ \hline  & Abstract not available for download \\ \hline  & Not written using the defined terms \\ \hline Method of review & \\ \hline Data extraction & Excel spreadsheets to check papers, authors, and features based on the protocol \\ \hline  & Bibliometric Analysis: \\  & \(\bullet\) publications over time; \\  & \(\bullet\) publications’ distribution in journals. \\ Narrative synthesis & Qualitative Analysis: \\  & \(\bullet\) analysis of selected publications: building logbook concept, implementation, existing building logbooks; \\  & \(\bullet\) description of findings, outcomes, and relationships. \\ \hline \end{tabular}
\end{table} 
Table 1: Research protocol.