To improve the herd health and production management on swine breeding farms the Department of Herd Health and Ambulatory Clinic (University of Utrecht) developed a computer package. The basic package includes action lists, physical performance reports, analysis and economic programs. During the development of the software package it was emphasised that the programs should be user friendly (easy to handle, with no special codes), and should have an enormous flexibility to guarantee easy updating and a long life for the whole package.