Replies to Common Objections

This chapter discusses a set of possible objections to the tractability constraint on computational-level theories. Any of these objections may naturally arise when reading Chapter 1. It is an option to read this chapter directly after Chapter 1. However we believe that the responses to the listed objections can be best appreciated after having mastered the formal concepts and techniques in Chapters 2–7 and familiarized oneself with the conceptual arguments in Chapter 8.