DMN 1.1 Issues: Aggregation

DMN defines “aggregation” in the following way:

“Multiple hits must be aggregated into a single result. DMN 1.0 specifies six aggregation indicators, namely: collect, sum, min, max, average. Optionally, the aggregation indicator may be included in the table. The default is collect.”

Below is a list of my issues with this DMN 1.0 approach. Continue reading

Posted in Decision Management, Discussions, DMN | Leave a comment

DMN 1.1 Issues: Multi-Hit Decision Tables

In an ideal world we would limit ourselves to Single-Hit decision tables that cover all possible combinations of the involved decision variables. However, DMN rightfully introduced so called “multiple hit” (or “multi-hit”) decision tables to stay closer to the decision modeling reality. Continue reading

Posted in Decision Management, DMN | 1 Comment

Enhanced Live Catalogs at

A few years ago, I wrote a web application that allowed professional communities to support Live Catalogs of different software tools. The “live” means that a product catalog is automatically updated whenever the profiles of products included into the catalog are added or updated by their authors. Continue reading

Posted in Decision Management, Tools and Technologies, Web Applications | Leave a comment

Decision Model “Vehicle Insurance – UServ Product Derby”

As a response to the challenge, I will describe an OpenRules-based implementation of the highly popular use case known as “UServ Product Derby”. The use case deals with automobile insurance problems including eligibility and pricing decisions for a hypothetical insurance company “UServ”. Its detailed description can be found here. Our implementation may be considered as another complex-enough example of the DMN approach. Continue reading

Posted in Decision Management, DMN, Use Cases | 1 Comment

Decision “Determine a Killer of Aunt Agatha”

Could we use decision tables to represent and solve complex logical problems? An example of such problem was offered by the in the Nov-2014 Challenge called “Who Killed Agatha“. Continue reading

Posted in Constraint Programming, Decision Management, Rule Engines, Tools and Technologies | Leave a comment

Resolving Conflicts among Business Rules

Contradictory business rules occur in normal business situations, and maintaining rules with exceptions is a very typical example of rule conflicts. Is it possible to automatically resolve such conflicts? Continue reading

Posted in Events, Rule Engines, Tools and Technologies | Leave a comment

Decisions with Mitigation Criteria

The Decision Management Community ( published an interesting Challenge in Oct-2014. It deals with a quite typical problem when some business rules may be mitigated by other rules.  Here is an OpenRules-based solution that follows the DMN guidelines. The main idea is to use multi-hit decision tables when more specific rules (mitigations) may override more generic rules. Continue reading

Posted in Uncategorized | Leave a comment