In Japan, children’s low motivation to learn and deterioration of mental health are problems. It is necessary to consider school facilities that contribute to these issues. In this study, a questionnaire survey was conducted to clarify the relationship between subjective evaluation of school environment and children's issues such as motivation to learn and mental health. As a result, elements such as ‘Peace of mind’ and ‘Classroom design’ have a direct influence on motivation to learn. Other elements such as ‘Noise & acoustics’ and ‘Thermal comfort / Air quality’ indirectly may affect motivation to learn and may also affect mental health.

In order to understand how humans judge, the softness of light in the daylight environment, two evaluation experiments were conducted. First, we asked the subjects about the judgment of the softness of light, using a picture of the room. Second, we asked them to quantitatively evaluate the items related to the softness of light in the room. As a result of analysis using structural equation modeling has led to the derivation of an evaluation structure that explains the softness of light. It consists of five perceptual observation variables.