The Survey of Income and Program Participation (SIPP) is a complex survey conducted by the Census Bureau to provide information for federal policy makers and academic analysts on topics such as part-year poverty, government program participation and eligibility, health insurance coverage, and income distributions. The SIPP has been used as a multi-purpose survey providing cross-sectional, longitudinal and current event information. The primary goal of the survey though is a longitudinal one - select a nationally representative sample of households and follow the people in those households to assess changes in their characteristics over time. Quite often, the multi-purpose uses of the data have compromised the longitudinal uses in terms of sample size, data product availability and important longitudinal analyses.