Because the Survey of Income and Participation (SIPP) is relatively new, research and evaluation to identify problems and develop improvements in methods and procedures is of utmost importance. The research will provide a wealth of valuable information for the SIPP and to other methodologists designing longitudinal and cross-sectional surveys. The paper discusses six experiments and five research and evaluation projects designed to evaluate or identify ways to improve the quality of the SIPP data, gather information about a specific problem so that further research or experimentation would be more focused, and explore new procedures.