A job analysis was conducted focusing on the knowledge important for beginning Earth and Space Science teachers. The results of the job analysis will be used to define the content domain of the subject assessment in Earth and Space Sciences for the Praxis series of professional assessments for beginning teachers. A domain of 292 knowledge statements and elements was developed by subject matter experts. These statements and supporting elements were then incorporated into a survey completed by 974 Earth and Space science teachers, teacher educators, and state administrators. These professionals rated the importance of each knowledge statement and element, and those ranking above the midpoint of the scale were considered eligible for the subject assessment. The 36 statements and elements that did not pass the cut point are not recommended for the final version. Emphasis, instead, should be put on the 256 knowledge statements and elements that did pass the cut point. Six tables present study results, and eight appendixes provide supplemental information. (Contains 16 references.) (Author/SLD)