We describe the use of Bayesian regularized artificial neural networks (BRA
NNs) in the development of QSAR models. These networks have the potential t
o solve a number of problems which arise in QSAR modeling such as: choice o
f model; robustness of model; choice of validation set; size of validation
effort; and optimization of network architecture. The application of the me
thods to QSAR of compounds active at the benzoaiazepine and muscarinic rece
ptors is illustrated.