# Parameters In the  parameters, you can specify a filter for the model. By specifying a filter, and using it, you ensure that only data set in the filter is retrieved from the database. You can use a parameter to filter a block; see [Blokken](invantive-control-blokken). The image indicates that the parameter is set to ‘A%’. This means that only organizations starting with the letter ‘A’ are retrieved by Invantive Control for Excel.  In this section of the model editor, you can add, modify, and delete parameters.  The meaning of the input fields is: | Code | The unique name of the parameter. | | ---- | ---- | | Description | The description of the parameter. | | Default Value | The default value of the parameter. | | Current Value | The current value of the parameter. |