A decision service is described that provides a decision making process for an application. The decision service includes a runtime interface, a resolver interface, and an inference engine. The runtime interface is configured to receive a request from an application to generate a decision. The resolver interface is configured to invoke one or more fact resolver modules to determine corresponding fact values. The inference engine is configured to communicate with the resolver interface to determine a plurality of fact values, and to compare the determined plurality of fact values to one or more rows of a decision table to determine a matched row. The decision provided by the decision service is a conclusion corresponding with the matched row of the decision table.