# The Smart Buildings Revolution: A Comprehensive Review of the Smart Readiness Indicator Literature
## 4 Results and Discussion
### Dominant Themes in the Smart Readiness Literature
#### 4.1.3 SRI's Alignment with Other Certificates and Standards  
A multitude of sustainability rating systems have emerged with the objective of evaluating the performance of buildings. Sustainability rating systems, such as the Digital Building Logbook (DBL) and the SRI, play a crucial role in evaluating building performance. The DBL was introduced by the EC as a repository of all the pertinent data on a building [17,57,58]. The SRI has significant potential to enrich the DBL by enabling the collection of real-time building data [57,58]. Integration of the DBL with other data sources, such as the SRI and energy performance certificates (EPCs), developing an interoperable, uniform, and cohesive national database on energy efficiency, is crucial [17]. The SRI supports energy efficiency and circularity in buildings [57]. As outlined by [PERSON] et al. [57], the absence of a centralized database to store the assessment reports at present prevents the SRI from being regarded as an interoperable data source compatible with the DBL. Additionally, frameworks assessing sustainability performance, such as key performance indicators (KPIs), are increasingly important for transitioning buildings to zero-carbon and resource-efficient structures. [PERSON] and [PERSON] [51] and [PERSON] et al. [3] proposed a repository of key performance indicators (KPIs) designed to assess the sustainability performance of buildings. This repository is particularly useful in the context of transitioning buildings to zero-carbon, resource-efficient, and resilient structures. The SRI comprehensively evaluates both internal factors, such as building characteristics and occupancy, and external conditions, such as weather and renewable energy generation [3]. [PERSON] et al. [60] proposed a method to decrease the primary energy demand (including domestic hot water, heating, and electricity consumption) by suggesting a self-assessment tool for building occupants that would provide an estimate of the EPC rating of a residence. Research on the KPIs for assessing the sustainability performance of buildings transitioning to resource-efficient, resilient structures, and zero-carbon has gained traction [3; 24; 59]. [PERSON] et al. [50] highlighted limitations in the proposed methodology for the SRI. They argued that the methodology should be more quantitative to effectively test the performance and progress of smart technologies in buildings. Therefore, the EPBD should consider advancing the current SRI methodology, along with the concepts of smart buildings (SBs) and smart readiness (SR). Consequently, the set of KPIs developed requires further testing to accurately evaluate the performance of smart retrofitted buildings. The SRI can contribute to and play a role in the development and assessment of KPIs for sustainability in buildings by evaluating factors such as energy efficiency [24; 59]. Several studies have explored frameworks for assessing the smartness and sustainability of buildings. [PERSON] et al. [61] suggested a framework for evaluating the levels of building smartness through automation and control. Their framework can determine the minimum requirements for achieving SRI levels in a cost-effective manner. They also noted that six of the nine service domains included in the SRI framework are also included in the ISO 52120 standard [72], indicating potential alignment between the two frameworks. [PERSON] et al. [18] explored the perspectives of end-users regarding the future development of EPCs to support EPC schemes in the EU. The findings underscore that features are perceived most favorably when tenants or homeowners prioritize energy conservation and consider energy performance a significant factor in property purchase or rental decisions. The European Building Automation and Controls Association (eu.bac) system certification scheme evaluates building automation and control systems (BACSs) with the objective of ensuring long-term sustainable operations and improving energy efficiency based on the EN 15232 standard [21; 73; 74].