## 3 Application of the Methodology to a Facade Renovation Use Case  
The described methodology was applied in a real use case to showcase, in a graphical manner, the process of a facade renovation. The information regarding the process, stakeholders, and information delivery was gathered from the Living Labs activities held in the framework of the BIM4 ren project with the stakeholders involved in the process. A two-step approach was leveraged to capture the renovation process, first by means of the application of the IDM standard to digitalize the process, representing the process in BMPN diagrams (as per Section 2.2), and second, applying the MVD approach (as per Section 2.3) to provide low-level information about the information to be exchanged between models that enables digitalization. As a result of the application of the methodology, several workflows of the facade renovation process were conceived from the different perspectives of the agents in the value chain, involved in different stages of the process. The workflows were drawn through BPMN diagrams presented in the enclosed material. Table 1 shows the list of workflows represented in the diagrams for the use case related to facade renovation, as an example of the application of the methodology. The \"ID1. Global process\" workflow represents the lifecycle phases of a generic renovation process from a global perspective. This diagram covers the full retrofitting lifecycle, from the strategic decision to the hand-over and maintenance phases. Figure 8 shows a general diagram of a renovation process as an example of the methodology application, according to the BPMN representation. The first rows represent the tasks of the renovation process from the perspective of the agents involved (owner, designer, contractor, and regulatory entities) whereas the last row is the information exchanged in each phase by typology of the stakeholder. The interaction between phases, stakeholders, and information exchanged is graphically mapped, as it is shown in Figure 8. \begin{table}
\begin{tabular}{c c c} \hline \hline
**Workflow Perspective** & **Source** & **Use Case Type** \\ \hline ID1. Global process & Own research & General diagram \\ ID2. Architect & Interviews & Specific diagram \\ ID3. Private owner & Interviews & Specific diagram \\ ID4. Public owner managing & Interviews & Specific diagram \\ social housing & Interviews & Specific diagram \\ ID5. Contractor & Interviews & Specific diagram \\ \hline \hline \end{tabular}
\end{table} 
Table 1: List of facade renovation workflows created from the methodology. The other BPMN workflows (ID2, ID3, ID4, and ID5) listed in Table 1, delivered as companion material to this reading, address the tasks involved in the life cycle of the building more deeply, from the perspective of different stakeholders. As an example, Figure 9 represents the \"ID2. Architect\" specific diagram. Each task, which represents activity in the generic process (see Figure 8), is expanded with the subtasks and EIRs from the point of view of the architect working in the facade renovation. To enable the comprehension of the \"process nesting\" in a more visual way, the general diagram including all the phases is presented in Figure 9. Additionally, the \"conceptual design\" has been amplified to show the subtasks, stakeholders involved, and the exchanged information. The full details of the diagrams are available in the mentioned companion material. Figure 8: Generic renovation process represented in a BPMN diagram (ID1). A transformation of the use cases into BPMN 2.0 workflows is achieved here. The sequence flows, indicating the orchestration between manual and automated tasks (services) are provided. The sequence flows are represented by a solid black line with a black arrow. The manual tasks involve human interaction, while automated tasks involve communication with different software systems. The EIR structure was based on the results from [74] and was collected for each use case in EIR tables (see Table 2), containing basic information.