The introductory sociology course is typically the only course most students take in sociology; hence, the introductory textbook becomes the only sociology textbook they may ever read as college students. The textbook, however, often lacks rigor in explaining concepts. This study focused on the thoroughness of explanations of the relations of substructure and superstructure of society by Karl Max (economic determinism) and Max Weber (ideological determinism) in a sample of introductory sociology textbooks. We found only one textbook to be consistently thorough in explaining both determinisms, and most textbooks were rated as low in their explanations of both concepts. We argue for greater thoroughness in introductory sociology textbooks, especially in the interest of students who participate in online learning and those who may not take another course in sociology and whose impression of the discipline would be framed by the introductory textbook.