Many students who attend school in California also take paper or computerized-adaptive tests developed in cooperation with the Northwest Evaluation Association (NWEA). These tests report student performance on a single, cross-grade scale, which NWEA calls the RIT scale. This scale was developed using Rasch scaling methodologies. RIT-based tests are used to inform a variety of educational decisions at the district, school, and classroom level. They are also used to monitor academic growth of students and cohorts. Districts choose whether to include these assessments in their local assessment programs. They are not state mandated. The versions of NWEA tests in use in California have been specifically aligned to match the content of local and California state curriculum standards. Because of this, it is believed there is a good match in content between the NWEA tests and the curriculum standards being used in California. In order to use the two testing systems to support each other, an alignment of the scores from the state and RIT-based tests is as important as the curriculum alignment. The current study is an expansion of a preliminary study of alignment of the California Standards Tests (CST) that was performed using data from one California school system in June 2003. It is one of an ongoing series of studies that are being conducted to identify the relationships between NWEA tests and state-mandated assessments. Studies of assessments in sixteen states have now been completed. The primary questions addressed in this study are: (1) To what extent do the same subject scores for the NWEA test correlate to the content-similar subjects on the CST? (2) What fall and spring RIT scores correspond to various performance levels on the CST tests? and (3) How well can "proficient" performance on the California assessments be predicted from fall and spring RIT scores? (Contains 24 tables and 9 figures.)