There are sets of skills provided by the game system in such a manner as to be easily applicable and extensible.
Skills sets start with low level sets and then proceed to ever increasing levels of specialisation.
Each low level gives a broad understanding, but specialisation is required to become very good at a task. The intention is to allow the system to cope with a stone age character living in a space age world without creating system induced anomalies. Being able to develop a skill is based on a set of prerequisites as are the levels within that set of skills. For basic skills these prerequisites are only abilities, but for higher level skills other skills may form the prerequisites for the skill. Skills can be categories into skill sets.