Recently we succeed completing 2 years work for inventing a new technique to reduce the adverse effect of Missing Data in Iran Peritoneal Dialysis registry. The technique which we named it Time-lining can significantly cure data who comes from disease registries and EHRs. It helped us to get rid of using Imputation and also relying on aggregate functions (e.g. mean) to deal with incomplete data. We also embed it in Hakim EHR.