Decisions
A decision is a method of executing rules with defined inputs and outputs, and a specific starting point.
A decision always begins with the DecisionStart rule set. It has a set of inputs that can be different from its outputs. The rules within a decision execute against the inputs and then the outputs reflect the results.
Decisions allow authors to only pass in the data that is needed to make a decision.

Create a decision
From the Rules menu, select Decision Context.

This creates a new rule with the default rule set DecisionStart.
The auto-created DecisionStart rule set cannot be renamed or deleted. This is the starting point of a decision and is necessary for the decision to run.
Decision parameters
Independent rule sets support parameters.
Parameters define values that can be passed into and returned from a decision.