Customizing method resolution requires the use of metaclasses that override SOMClass methods. This is not recommended without use of the Cooperative Metaclass that guarantees correct operation of SOMobjects in conjunction with such metaclasses. SOMobjects users who require this functionality should request access to the experimental Cooperative Metaclass used to implement the SOMobjects Metaclass Framework. Metaclasses implemented using the Cooperative Metaclass may have to be reprogrammed in the future when SOMobjects introduces an oficially supported Cooperative Metaclass.