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# Tutorial

The essential steps to run a first simulation to get a impression of GREAT-ER are printed within a gray shaded box (like this one). They represent the minimum contents of the tutorial.

The complete tutorial chapter can be seen as a guided tour through all the main features of GREAT-ER.

Finally, Chapter 3 serves as a reference manual and provides a complete overview of GREAT-ER features.

- Basic Concepts
  - Scenario Concept
    - Scenario Database
    - Active and Open Scenarios
  - Substance Database
  - Expert Mode vs. Easy-To-Use Mode
  - Model system
  - Parameter handling
- Starting GREAT-ER
- Setting up a scenario
  - Creating a new scenario
  - Needed inputs
  - Editing substance data
  - Editing catchment data
- Running a simulation
  - Save a scenario
    - Save
    - Save As
- Analysing model results
  - PEC Calculations
    - PEC initial
    - PEC catchment
- Additional display options
- Data Exchange
- Limitations
  - ARCVIEW
    - Chart Display
    - Error Calling Unlink
    - Error in Application
  - User Interface
    - Distributions
    - Default Values
    - GREAT-ER Analysis Tools
    - GREAT-ER Help System
    - Operating System WINDOWS NT 4.0
    - Creating Directories
  - Model System
- Adding a new catchment