This content analysis explored how previously validated Web-based inquiries (WBIs) for science instruction are designed and to what extent they match the proposed teacher-support guidelines of the American Association for the Advancement of Science. Examined WBIs implemented few recommended teacher-support mechanisms. This article explores the reasons why so few mechanisms were supported and proposes ways to enhance the curricular usefulness of WBIs by incorporating more recommended mechanisms. (Contains 3 tables and 2 figures.)