[rules-users] Rules writing best practice?

Hi, Is there a rules writing best practice document somewhere? I'm asking the question because as a newbie rule writer (which doesn't know anything about the underlying drools matching algorithm), I'm wondering if my rules will behave gracefully. For instance, I (ab)use a lot the from/accumulate to bring in the knowledge some external facts coming from some DAO. All my rules use one time or more the same "from dao.getInformationFromDatabase( <inserted fact> )" structure and I'm not sure the algorithm is smart enough to cache this information which is constant for a given inserted fact. Should I instead insert all this information as facts prior to the rules firing? -- Brice Figureau My Blog: http://www.masterzen.fr/