A method of evaluating a pairing between a first player and a second player of a multiplayer application comprises the steps of obtaining one or more parameter values for each of the first player and the second player, inputting the parameter values for each of the first player and the second player into an artificial neural network, obtaining at least a first pairing fitness value output from the artificial neural network, and selecting to pair the first player and the second player in dependence upon a criterion responsive to the each pairing fitness value.