The document discusses environment analysis, which involves analyzing factors in the learning environment that will affect curriculum design decisions. These factors can include characteristics of the learners, teachers, classroom, resources, and time available. Understanding constraints like class size or language level involves gathering local information as well as considering relevant research findings on how to address the constraint. The example of the time constraint illustrates how curriculum design can work within a constraint by limiting goals or using intensive study, or try to overcome it through self-study or extending course time. Overall, environment analysis is important for developing a usable curriculum that accounts for real-world situational factors.