*2.1. Sample*

The sampling model is non-probabilistic by convenience and intentional, based on the representativeness of the areas of knowledge and the diversity of the space design. In other words, more and less illuminated rooms, more and less ventilated rooms, etc., were searched to obtain a sample with a wide range of possibilities in order to be able to relate the different levels of the predictor variables. The LESI scale was completed by 796 undergraduate students from 18 bachelor degree programs at Universidade da Coruña, who were reasonably balanced among arts and humanities, engineering and architecture, health science, science, and social and legal sciences. Table 1 shows the distribution of participants by bachelor degree program. The number of students in each degree program is proportional to participants in the study.


**Table 1.** Sample distribution by bachelor degree program.

#### *2.2. Data Collection Instrument*

Learning Environment and Social Interaction (LESI) is a 1–7 Likert scale that is part of the Student Perception Questionnaire of Learning Space [68]. The instrument seeks to measure the collective perception of the environment by users regarding its power to favor learning interactions, the indoor environment quality satisfaction, and the importance of learning interaction in education. Students rated 18 independent variables from 1 (completely disagree) to 7 (completely agree). In addition, grade point average was requested at the beginning of the test template (Table 2).

**Table 2.** LESI scale items.

