## 4 Results
### Session/Period-Based Analysis  
A detailed analysis of the commands executed by each specialist during the different sessions/periods of time of the experiment was carried out according to the methods explained in Section 3.3. Thus, as can be seen in Figure 5, real time intensities are lower than active time intensities, since the latter do not take into account pause times. The real time and active time intensity curves are slightly separate in sections where the designer took a few short pauses, while there is greater separation where the designer took a longer pause (>10 min) or a greater quantity of short pauses. In those periods where the designers did not execute any command, both curves go to zero, which represents a long pause in their work. Figure 4: Pareto charts of contributory commands for each specialist. From this analysis, it can be observed that all the designers frequently took short and long pauses, except for the plumbing specialist, who often took long pauses that bring the curve to zero. However, while working this designer executed commands more uniformly, which is reflected in the frequent coincidence of both curves. The intensity of the architectural designer's commands was clearly the highest, with rates of between 300 and 500 commands per hour. The rest of specialists presented rates of between 200 and 350 commands per hour, with the exception of the plumbing designer, whose work intensity increased to 300 to 600 commands per hour in the last 20 periods (i.e., four sessions). It is worth mentioning that the calculations for these intensities included non-contributory commands and consequently a deeper analysis should be carried out in order to identify anomalies. For example, given the data shown in Table 2, the architectural designer's higher command intensity could have been triggered by the great amount of 'Cancels' he executed during the experiment. During the experiment, the team worked together, but not everyone worked with the same intensity at all times mainly due to the need to generate a base model for other specialists to begin. Figure 5 shows the evolution of each specialist's work over the 18 sessions (90 time periods), of which the first several were dedicated to preparation and to determining and creating elements and families to be used within the project. In these initial sessions, the architectural and structural designers were of great importance, since their early work determined heights and spaces where the MEP specialists  
Figure 5: Real time and active time work intensities for each designer. could install their elements. It can also be observed how their command intensities followed a somehow paired curve, with long pauses in periods 20, 34, and 67. As the experiment progressed, it can be observed how the MEP designers intensified their work, which was initially on standby due to required prior information to be able to advance. In the final phase of the project, all the specialists intensified their activity. This was on account of delays generated during the process that had to be compensated for to finish the project on time. In addition, the need to model construction details, solve clashes between models, and generate quantification tables had a significant influence in this final stage. While the mechanical and electrical designers had a uniform work intensity during the experiment, the plumbing designer showed a remarkable increment from period 70 until the end, whose cause would be worth studying in detail. In Figure 6, the distribution of the real-time execution intensities for each sub-category of commands is presented. The architectural designer provided geometrical content for the model with the highest uniform intensity of all the specialties (\(\sim\)10 to \(\sim\)60 commands per hour in 50% of the time periods). Alternately, the plumbing designer stands out with the highest rate of non-geometrical modeling commands (0 to \(\sim\)11 commands per hour), while the mechanical designer hardly ever provided this kind of information to the model.