The Analysis Subcommittee was formed to provide expert advice on shared analysis issues, such as the development of methods for within-study analysis for studies with significant ethnic variation, related individuals and/or longitudinal data. With the different genotyping platforms utilized and unique characteristics of each study, the Genotyping Subcommittee was established to streamline submission of samples for genotyping, establish standards for QC and serve as a liaison with the Analysis Subcommittee to tackle novel concerns arising from data-cleaning efforts on the genome-wide marker panels. To facilitate effective collaborations both within and outside GENEVA, the Imputation Working Group addresses methods of imputation, including choice of reference panel and how these imputed data should be distributed and analyzed.