Context: Formal education occurs in a structured environment whose explicit purpose is teaching students. Usually, formal education takes place in a school environment with classrooms of multiple students learning together with a trained, certified teacher of the subject. Most school systems are designed around a set of values or ideals that govern all educational choices in that system. Such choices include curriculum, organizational models, design of the physical learning spaces (e.g. classrooms), student-teacher interactions, methods of assessment, class size, educational activities, and more.

Question: Where does formal education take place?
Answer: school environment

Question: What are some of the sets or ideals most school systems follow?
Answer: student-teacher interactions, methods of assessment, class size,

Question: Who guides the students in a formal environment?
Answer: certified teacher

Question:  Where does informal education take place?
Answer: Unanswerable

Question: What is the implicit purpose of a structured environment? 
Answer: Unanswerable

Question: What system is not designed around values and ideals?
Answer: Unanswerable

Question: What doesn't guide students in formal environments?
Answer: Unanswerable

Question: Who guides the students in an informal environment?
Answer: Unanswerable