For general information on assessment:
Angelo, Thomas A., and K. Patricia Cross. Classroom Assessment Techniques. San Francisco: Jossey-Bass Publishers, 1993.
Saphier, Jon, and Robert Gower. The Skillful Teacher. Acton, Mass.: Research for Better Teaching, Inc., 1997. (This book was written originally for K-12 teaching, but includes an outstanding chapter on assessment.)
For classroom assessment:
Cross, K. Patricia. Developing Professional Fitness Through Classroom Assessment and Classroom Research. The Cross Papers. No. 1. Phoenix: League for Innovation in the Community College, 1997.
For more information on grading systems, see the following link: