Some compensation is made for these effects by the inclusion of some empirical data. Hence these methods are termed semi-empirical MO methods. Electron repulsion is taken into account by considering the interaction of a given electron in a particular orbital with the mean field from all the other electrons in the molecule. The Schroedinger equation is solved for that electron at that potential energy and a wave function derived. This is repeated for all the other electrons.
All programs give some sort of a message to indicate when self consistency has been achieved.
However there are frequently other factors to look for in the output to assess just how well the molecule is really optimized. However even here the gradient norm should be checked and it should be either not present in the print out because it is suitably small or it should be as small as possible. Several other exit modes are also acceptable though the results should generally be treated with a bit more caution. The first format is as cartesian coordinates. The second input format is in the form of internal coordinates arranged in a form called a Z-matrix.