The Current D/L method is a statistical method invented by statisticians Frank Duckworth and Tony Lewis. It is designed to calculate the target score (or the PAR score) that the second batting team (in a rain-interrupted match) needs to achieve. Today, there are two D/L models/editions that are available to the cricket community: Standard Edition and Professional Edition. The Standard Edition is a chart-based model used for non-ICC match and local matches. The Professional Edition is a software-based black box model, and is used by the ICC for all official matches.