When trying to apply fauceir rules to explain some observations and to project further developments, the following steps can be applied.
- Determine the limits of a fauceir. That is dissect which are internal fauceirs that are more or less enslaved and which are external fauceirs that exert the pressure of natural selection.
- Determine the properties of a fauceir. Those properties are inherited from slave fauceirs and may be subdivided.
- Determine the evolutionary pressure and how the fauceir can comply with it.
- Determine the chances to adapt to the selectional pressure.