Eleven published programs for performing nonlinear regression using a microcomputer have been reviewed. They have been assessed according to many criteria, especially: application, program language, algorithm used, method for calculating partial differentials, facility for weighting, desirable input and output features, robustness during execution, memory requirements, accessability, ease of implementation and evaluation and testing. No one program contains all the desirable characteristics discussed, but guidance is given as to which might be the most suitable for a particular purpose or for a given microcomputer system.