Conclusion

The simplicity of the COMMAND pattern belies its versatility. COMMAND can be used for a wonderful variety of purposes, ranging from database transactions to device control to multithreaded nuclei to GUI do/undo administration.

It has been suggested that the COMMAND pattern breaks the OO paradigm by emphasizing functions over classes. That may be true, but in the real world of the software developer, usefulness trumps theory. The COMMAND pattern can be very useful.