In general, fraud rules define a set of checks to be applied, and action to be performed depending on a check result.
It is possible to configure a number of checks (performed by different anti-fraud plug-ins) for a single rule. These checks are called conditions and can be configured at any moment after a rule is added. Thus, a rule is created in two steps: first you define a rule general settings and after this add conditions.
Finally, rules are composed into fraud filters. Types of orders to be checked are defined per fraud filter.