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The implementation of Layers makes optimizations easy and organized. Instead of creating separate nodes in a pipeline, another set of nodes with a different color is stacked on top of previous analyses (Figure 15). To see the parameters that were changed between runs, hover the mouse icon over the set of stacked task nodes and a pop-up balloon will display them. The text color signifies the layer corresponding to a specific parameter.

Layers are formed when the same task is performed on the same data node more than once. They are also formed when a task node is selected and the Re-run it w/new parameters is selected in the task pane. This will allow the users to change the options only for the selected task. The user may choose to re-run the task to which the changes have been made, as well as all the downstream tasks until the analysis is completed. To do so, select Re-run w/new parameters, downstream tasks from the task pane.

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