Expert user Vs Novice user
Expert users (meaning with extended experience in the application) expects advance features and capabilities. They will want more customization options. Since they have a stable mental model of the application structure they feel free to explore the application and try new things. They will not be too worried about making mistakes since they feel secure that they will know how to bypass them.
Novice users, on the other hand, are new to the system and will need a simple and basic interface. Since they are new in the system they will expect more secure ways of doing things in the system (for example they will choose the templates or wizards to do their first steps in the system). Novice users’ interface should provide simple ways to achieve important frequently performed tasks. When designing to novice users we should remember what the main use cases and don’t shadow them with unnecessary features.