This paper focuses on an early stage of developing curricular materials to support students' learning of scientific inquiry. The materials being developed and tested, called Classroom FeederWatch (CFW), aimed to support science inquiry and were developed by a collaborative team of private curriculum developers and scientists (ornithologists). Inquiry dimensions were influenced at the outset by the newly released "National Science Education Standards" (National Research Council, Washington, DC: National Academy Press, 1996) and by prior successful experiences of ornithologists with inquiry experiences for adults. Despite hopes that CFW materials would assist middle school students to learn inquiry, evaluation findings showed little increase in students' understanding of inquiry or the ability to plan and conduct inquiry. We learned that improvements to inquiry dimensions of the curriculum required aligning activities more closely with practices that reflected the work of scientists in the discipline, integrating learning of content knowledge with learning about inquiry, and adjusting evaluation protocols to more accurately assess inquiry as represented in the "Standards." Discussion highlights the influence of the "Standards" on development of inquiry dimensions of the materials, including the way in which initial application of the "Standards" to the early version of CFW materials may have restricted the engagement of both students and teachers in conducting science inquiry.