Next: Model system Up: Basic Concepts Previous: Substance Database

### Expert Mode vs. Easy-To-Use Mode

GREAT-ER offers two modes for the user interface: The expert mode and the easy-to-use mode.

'Expert' in this context requires familiarisation with GIS in general and with ARCVIEW in detail. The expert mode gives access to all ARCVIEW operations and commands. This includes the possibilities of undocumented changes or deletion of basic GREAT-ER data sets. Obviously, this feature provides additional capabilities but also contains a hidden danger. You should decide carefully whether to perform operations in the expert mode or not. An expert beginner should be able to decide which kind of operations should not harm the whole system and its data sets.

'Easy-to-use' basically makes it is impossible to harm the system and/or the underlying GREAT-ER data sets. If you are only interested in performing simulations and viewing the results, this mode is sufficient.