To help teachers guide their instruction, a university science educator who researches students’ science beliefs and a fifth-grade classroom teacher investigated how elementary students interpreted some of the ideas found within the National Science Education Standards. As a result, they developed an online test—The Elementary Students’ Science Beliefs Test—covering several essential K—4 understandings for elementary students in life, physical, and Earth sciences. What follows is a description of their experience and reflections after administering the test to a group of third-, fourth-, and fifth-grade students in a suburban Michigan school.