I plan on conducting a study on various instructional activites for algebra 1 students. I am looking for an effective and reliable algebra 1 instrument that measures both procedural and conceptual levels of understanding. I have reviewed problems from the California Assessment Program in the text Assessing Higher Order Thinking in Mathemathics by Geruld Kulm. The California instrument contains high quality multiple choice and open ended questions. I would like to use such a test if it is available. I would like to give a pre and post test to examine changes in students'algebra knowledge. If you or your school district are using valid and reliable test instruments to assess changes in students' conceptual and procedual knowledge as related to algebra 1 topics, I would appreciate learning on how to obtain such an instrument. If the NCTM has endorsed any such algebra assessment instruments they would also be of benefit.