Composition scholars have contributed many theoretical analyses that WPAs and teachers might apply to first-year composition textbooks in order to make informed decisions about book adoption and implementation. As they offer critiques of the ideological effects of FYC books, many of these studies call composition textbooks "tools" without exploring the implications of textbook "qua" tool. The following essay addresses this unexamined area by developing a theory of "valuation," a linguistic and rhetorical process of assigning worth to students and textbook instructional apparatuses as student-readers might engage with the texts. An analysis of valuation by WPAs and teachers has the potential to foster the empowerment of students, the instruction of critical thinking and writing, the autonomy of new teachers, and the coherence of local writing programs.