====Context screen====

The context screen lets you select which [[contaminant|contaminant(s)]] is relevant for your study. If your study includes modelling concentration in [[food]] items, or if you just need to enumerate food items that the local population consume, this is where you define them. If you are calculating exposure to more than a single individual, you can define which individuals to model here. 

The context screen is located after the [[model screen]], as the model components determine which contaminants are available, or which types of food you can include.

====Tool bar====

| {{ help24.png }}| Help | Shows this page |

====Contaminants====

The **Available** list shows all the [[contaminant|contaminants]] for which there are (or might be) default parameter values. Select a contaminant in the list to include it in your study. If the contaminant you are studying is not in the list, you can add a new contaminant by clicking the **Add** button. You can add new substances based on Simplified Molecular Input Line Entry System (SMILES) that is used as input in VEGA tool.

====Food====

When you add a human intake model, this tab allows you to specify which [[food|food items]] is/are relevant for your study. The list displays a list of ingestibles which can be modelled by the software. If you have included a model for Soil, and want to include the exposure pathway "ingestion of soil", you must select **Soil** in this list. 

If you want to include exposure through ingestion of food which is external to the investigated region, click the **Add** button. Select an external ingestion source and click **Remove** to remove it. 

====People====

If you have added the body model or the human intake models for populations, this is where you specify which different individuals or groups of people you need to investigate. 

Click **Add** to add a single individual, **Add many...** to generate a list of individuals (useful if your study includes many individuals). The **Remove** button, like expected, removes an individual.

====Scenario====

To set up [[scenario|scenarios]], click the **Scenario** button on the right hand side of the screen.

The scenarios panel lists all [[scenario|scenarios]] defined for the [[project]]. 

New scenarios can be defined by either clicking the {{New24.png}} **Add** button or by right-clicking the window and selecting **Create** from the menu. You can also select which objects depend on scenario by clicking the **Select** button.

===Table===

Each item (row) in the table details one scenario. The table can be sorted on a specific property by clicking it's column. 

  * **Enabled** - Allows you to exclude scenarios from the simulation. Simulations will only be run for scenarios which are enabled.

  * **Name** - The name of the scenario. This name will also be the name displayed in the [[charts screen]] and [[tables screen]] after a simulation.

  * **Description** - The description of the scenario.
 
  * **SS** - Simulation settings: click this button to specify simulations settings which are specific to the scenario. For reference see [[simulation screen#simulation settings]].

  * **PS** - Probabilistic settings: click this button to specify probabilistic settings which are specific to the scenario. For reference see [[simulation screen#probabilistic settings]].

  * **SS** - Sensitivity analysis settings. Click this button to specify sensitivity analysis settings which are specific to the scenario. For reference see [[simulation screen#sensitivity analysis settings]].


===Menu===

To display the menu, right click anywhere inside the window. 

| Create | Adds a new scenario. |
| Edit | Opens an edit dialog window for the selected scenario. |
| Find... | Lets you search for text appearing in the table. |
| Enable/Disable | Toggle enabled for the selected scenarios. |
| Select all | Selects all rows in the table. |
| Copy text | Copy the //text// in the table to the system clipboard. |
| Delete | Deletes all selected scenarios from the system. |
| Select... | Select objects which values should vary depending on scenario.|