The Well-Being Systems model provides a robust and parsimonious framework for understanding the nature of individual human choice-making, particularly the types of "language sphere" choices most people are used to thinking about. This chapter explores the opportunities suggested and questions posed by extending the Well-Being Systems model to the human realms that lie below the level of the individual as well as those involving multiple individuals. It discusses how the current Well-Being Systems model raises many, currently unresolved questions at the smaller grain-sizes of neural and cellular functioning. The chapter also explores the implications for extending the Well-Being Systems model to very large grain sizes, for example at the level of organizations or ecological communities. It focuses on just a few examples within each of these grain-size categories, and remains highly speculative. The chapter provides some closing thoughts on the concepts discussed in this book.