Introduction In a business process, decision-making is essential because it defines the logic that guides the execution of activities. Historically, this logic was externalized into rule engines such as Drools, separating decision-making from orchestration. However, in today’s environments where transparency and collaboration are key, this separation reveals its limitations: rules often remain hidden in technical files, difficult to understand and maintain. Before introducing DMN, it’s important to present the execution platform. What OrqueIO brings: 100% open-source and fully compatible with your current BPMN/DMN models, connectors, scripts, and APIs Ongoing maintenance and guaranteed security updates, ensuring long-term reliability and stability New, practical features for daily use, including improved Cockpit monitoring and native DMN integration Enhanced performance and engine stability, even under high load Expert technical support, transparent and reliable — with no vendor lock-in In summary, OrqueIO enables organizations to preserve their existing investments while adopting a modern, sustainable, and open orchestration platform — an environment where integrated decision logic with DMN naturally thrives. Excessive separation from the BPMN process: Maintenance complexity: Barrier for business teams: Lack of traceability and transparency: Rigid update cycle: Limits in agility and governance: OrqueIO natively integrates the DMN standard (Decision Model and Notation), enabling the unification of process logic (BPMN) and decision logic within the same platform. Clear and accessible rule representation Native BPMN ↔ DMN Integration Built-in traceability and audit which rules were evaluated, the input values, and the resulting outputs. This greatly simplifies audits, gap analysis, regulatory compliance, and continuous improvement. A complete and consistent ecosystem BPMN for process orchestration, DMN for decision logic, Cockpit for monitoring and analysis. Everything is centralized, extensible, interoperable, and designed to enhance collaboration between business teams and IT. The transition from Drools is not just a tool replacement — Centralization of decisions and processes Simplified maintenance Enhanced collaboration Monitoring and transparency Below is a comparison table summarizing the main differences between Drools and OrqueIO: We want to apply discounts based on: the customer type (Standard, Premium, VIP) the order amount (orderAmount) Drools version (Before) .drl file contains the rules, written in Drools syntax import io.orqueio.bpm.exemple.dmn.model.Order; rule "Standard = 100 && orderAmount = 500" when $o : Order(clientType == "Standard", orderAmount > 500) then $o.setDiscount(8); end rule "Premium = 100 && orderAmount = 500" when $o : Order(clientType == "Premium", orderAmount > 500) then $o.setDiscount(20); end rule "VIP = 500 && orderAmount = 1000" when $o : Order(clientType == "VIP", orderAmount >= 1000) then $o.setDiscount(30); end Implementation with DMN in OrqueIO With DMN, the decision logic is defined in the form of a decision model, in which we explicitly describe: which data serves as inputs to the decision, which conditions are applied, and which result must be produced. This model can be edited visually, either as a table or as a diagram, which allows business teams to understand and adjust the logic more easily. At the same time, that same logic is stored in a standard DMN XML file, which is used by the engine for execution. In the BPMN diagram, you simply add a Business Rule Task: Calling a decision does not require any complex configuration. Migrating from Drools to OrqueIO DMN is more than a modernization effort — it is a strategic shift toward transparency, agility, and collaboration. By bringing decision logic closer to BPMN processes, organizations eliminate silos, simplify maintenance, and empower business teams to directly contribute to the evolution of rules. The result is a unified, traceable, and adaptable system where decisions are easier to understand, update, and audit. With OrqueIO DMN, your business logic becomes clearer, your delivery cycles faster, and your governance stronger. This transition enables organizations to move from rigid rule engines to an integrated decision model that supports continuous improvement and operational efficiency. 🌐 Learn more about OrqueIO example Order Process from the OrqueIO webinar