As the description of "force" discusses "delay" / "lazy" / "force" in detail, it seems strange that it doesn't introduce the term "promise" but refers to section 4.2.5 for that which, in turn, points to this section for a detailed explanation. This should all be at one spot; I propose to move everything there is to know about "delay" / "lazy" / "force" to move to this section, and reduce the descriptions in 4.2.5 to be not much more than forward references.
Ideally, the description in one chapter (preferrably chapter 4) is minimal -- not much more than a reference -- and everything else described in the other. Currently, they are important parts of the description in both chapters which, regardless of where you start, requires you to jump to the other chapter to get the full picture.
--Denis Washington
Everything has been moved to chapter 4, except for a minimal note at the beginning of chapter 6 pointing to the appropriate sections of chapter 4 for force, eager, and make-parameter.