## 1 Introduction
Therefore, several national versions of the building logbook with different involved stakeholders, requirements, and features exist according to the country considered [2]. A digital building logbook, by gathering and organizing data related to a building [5], can serve multiple purposes, such as enhancing building efficiency [12], supporting maintenance strategies, managing technical aspects, ensuring safety, and preserving economic value [13]. It also helps reduce the time and cost associated with retrieving missing information [5] and promotes digitalization within the AECO sector [2]. Additionally, a digital building logbook plays a crucial role in facilitating building renovation [2]. According to [PERSON] et al. [2], the digital building logbook can support initiatives like the \"Renovation Wave\" [11], which aligns with the \"European Green Deal\" policy set by the European Commission [14]. It encourages renovation by compiling data on building performance and maintenance throughout its lifecycle, aiding in the development of renovation roadmaps, maintenance planning, and decarbonization progress assessment [2]. These data should be integrated with the official document that rates the energy efficiency of buildings (Energy Performance Certificate--EPC), technical inspection reports, the Smart Readiness Indicator(SRI), which assesses a building's ability to use smart technologies, or building renovation passports to provide a comprehensive understanding of the building and its energy efficiency, as well as to minimize performance gaps. Consequently, having all this information leads to better-informed decisions about when and how to undertake renovations [2]. Moreover, the digital building logbook, functioning as a repository for building-related information, can be incorporated into the building renovation passport [15] and linked with a renovation roadmap [15; 16], which outlines each step of the renovation process [15]. Information related to building type and age, property plans and obligations, periodic synthesis data resulting from sensors continuously monitoring the indoor climate (air temperature and air relative humidity), indoor air quality (CO\({}_{2}\) concentration and volatile organic compound (VOC) content), and thermal comfort (predicted percentage of dissatisfied (PPD) and predicted mean vote (PMV)), information on energy consumption and energy costs, and the main significant interventions executed for maintenance (e.g., boiler replacement) can be collected within the digital building logbook [17; 18; 19; 20]. Given this scenario, this research aims to report on the status of the digital building logbook tool through a systematic review based on published research articles. The study will comprise an analysis of the main information that can be collected within the digital building logbook, taking into consideration the different purposes that the tool can serve during the different phases of the lifecycle. Along with this, the paper investigates the role that the digital building logbook can have in supporting the circular economy. Finally, even considering an instrument that collects building-related data like the digital building logbook, there is a need to question data management and related issues. This research aimed to answer the following key question: What is the status of the building logbook and the state of the art of the AECO field? The exchange of data and information has become more frequent, and the number and variety of stakeholders involved have increased during the in-use phase; as a result, managing, collecting, and using this information have become more complex. Therefore, the study focuses on understanding to what extent the digital building logbook impacts operations and maintenance, supporting more efficient facility management (FM). For this purpose, a specific search including both \"digital building logbook\" and \"AECO\" concepts has been performed in two databases (Scopus and Web of Science).