CloneSelector is an Excel based tool developed to help plant breeders, working with clonally propagated crops, carry out field trials, analyze the results and make accurate selection decisions. In version 3.x you can elaborate a list of germplasm to test, select an appropriate statistical design and the corresponding fieldbook , enter experimental data as well as information about the experiment, calculate derived variables and produce some statistical results. All this can be done while using the popular Excel interface only. Adapted from the Maize Fieldbook developed by CIMMYT, CloneSelector has been built around the widely used Excel workbook and the open source R statistical package. Development of the tool is an ongoing activity by the International Potato Center under the Sweetpotato Action for Security and Health in Africa Clone(SASHA) project.