## 3 Results
### Thematic Analysis of Selected Articles
#### 3.2.1 Digital Building Logbook Structure and Data Categories
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Categories EU** & **ALDREN BuildLog** & **iBRoad** & **BIM4 EEB** & **X-Tendo** & **DigiBUILD** \\
**DBL Study** & [36; 40; 47] & **Logbook** & **Digital** & **Logbook**[27] & **Logbook**[36] & **Logbook**[33] \\ \hline Administrative information & & General and administrative information & General and administrative information & Administrative information & General information & General information \\ \hline General information & Building picture & Building & Building & Building & Building & Building \\ \multirow{2}{*}{\
\begin{tabular}{c} Building \\ descriptions and \\ characteristics \\ \end{tabular} } & & Construction & Construction & and characteristics & & description \\ \hline Building operation and use & Energy verification & Building operation and use & Building operation and use & Building operation and use & Building operation and operation \\ \hline Building performance & Energy rating \& target & Building energy & Building energy performance & Building performance & Building performance \\ \hline Building material inventory & Documentation—BIM & - & - & Building material inventory & Building material inventory \\ \hline Smart readiness & &
\begin{tabular}{c} Smart information \\ \end{tabular} & IoT information & Smart readiness & Smart information \\ \hline Finance & Cost value risk & & & Finance & Financial information \\ \hline \hline \multicolumn{5}{c}{Complete alignment with the indicators of the EU DBL study} \\ \hline \multicolumn{5}{c}{Partial alignment with the indicators of the EU DBL study} \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Comparison of different Horizon2020 logbook data structures with EU DBL study. logbook does not fully align with the category from the EU DBL study. Additionally, some categories from the EU DBL study do not have corresponding entries in the other logbooks. By observing Table 4, it is noted that there is a direct correspondence between the X-tendo logbook and the EU DBL study: in fact, the X-tendo logbook follows the structure defined by the European Union [2]. In addition, each analyzed logbook contains a category that aims to describe the identifying characteristics of the building, such as its geometry, location, use, documentation, certifications, technical components, and general ownership information. Departing from the EU DBL study, the two categories \"Administrative\" and \"General\" are combined into a single category called \"General and administrative information\" in BIM4 EEB, iBRoad, and DigiBUILD and \"Building picture\" as defined in ALDREN. Another category that corresponds in almost all logbooks is \"Building descriptions and characteristics\", which, in the case of the ALDREN BuildLog, is instead found under \"Building picture\". This category includes technical information and data about the building's construction, with the architectural and structural features of the building. Similarly, the \"Building operation and use\" category is defined in each logbook, and it is called \"Energy verification\" in ALDREN BuildLog. It contains data on how the building is used, including occupancy rates and operational schedules. Attention to \"Building performance\" is given in each logbook, and ALDREN BuildLog has two categories, \"Energy rating and target\" and \"Comfort and Wellbeing\", to describe it. It refers to information on energy efficiency, water usage, and other performance metrics. Moreover, \"Smart readiness\", as a key category, is included in all the examined logbooks, except for the ALDREN BuildLog. This category focuses on the IoT and smart devices deployed in the building. \"Finance\", or \"Cost value risk\" in ALDREN BuildLog, is another significant category found in all the analyzed logbooks, except for the iBRoad-Log and BIM4 EEB. It regards financial data related to building operations, maintenance costs, and potential returns from energy-saving investments.