Foundations, frameworks, lenses: the role of theories in bioethics.

I explore the implications of the foundation metaphor for understanding the role of moral theories in ethics and bioethics and argue that its disadvantages outweigh its advantages. I then consider two other metaphors that might be used instead, those of frameworks and lenses. I propose that the metaphor of lenses is most promising in providing methodological guidance for drawing on moral theories when deliberating about bioethical problems.