procedure, based on heuristics, which are likely to improve its

performance. Since a different solution procedure will be the result,

it is necessary to re-enter the program stream at the point that the

tear variables are chosen. The present implementation of GENIE provides

the capability of partitioning the FVIM into groups of functions and

variables to be solved by tearing and Newton-Raphson. The modifications

possible are moving functions and variables from one partition to

another. An alternative modification would be to assign a different

output set.