State special education regulations on class size/caseload in special education programs and services are analyzed, and regulations from 21 states are excerpted. Research on class size in general education and special education is reviewed. While there are hundreds of studies reported for general education, there have been very few studies focused on class size and special education. Characteristics of some state regulations that govern student-teacher ratios are addressed. State requirements for class size/caseload in special education programs and services are more specific and complicated than those for general education. It is suggested that there is no single best way to determine appropriate class and group size for special instructional programs and services. However, there is a need for more research to identify factors involved to support the policymaking process. Regulatory information is presented for the following states: Alabama, California, Illinois, Indiana, Iowa, Kansas, Massachusetts, Maryland, Maine, Michigan, Missouri, Nebraska, New Hampshire, New Jersey, New York, North Carolina, North Dakota, Oklahoma, Pennsylvania, Utah, and West Virginia. (Contains 14 references.) (SW)