Full text can be accessed at http://www.sciencedirect.com/science/article/pii/0098300490900685A Turbo-Pascal program for automatic interpretation of magnetic anomalies caused by a dike, prism, or buried slope model of infinite strike length is presented. The residual between the observed and the calculated anomalies is minimized by adjusting the model parameters automatically. The change in model parameters is determined by decomposing the matrix of partial derivatives into singular values using a compact algorithm.