E-CBR-O (we call it “Easy Bro” for Easy CBR Ontology) is a lightweight CBR ontology. Easy Bro offers the following advantages:

• Minimum efforts to start modeling focusing on semantic knowledge representation.
• Modular semantic case design extendable to any arbitrary case structure.
• Integrates with any other CBR modeling ontology or framework.
• Attribute-Value pairs can be reused.
• Cases can be incrementally extended with new attribute-value pairs.
• Merging of different CBR systems in distributed and disaggregated settings.
• Agent-oriented modeling support.
• Free and flexible case order (hierarchical, etc.)

E-CBR-O represents the core CBR data model and case-based reasoning paradigm as an ontology. It can be used as a top-level semantic model to define individual CBR projects and aggregate various collaborative CBR projects. It explicitly does not include second-level modeling, such as realizing similarity measures, attribute management, and case clustering. This is intentionally left to third-party models. The target audience comprises users who wish to implement a CBR structure with minimal effort based on their own ontologies. This aligns with the goal of the PIRI approach, which aims to integrate diverse regulatory domains. The PIRI ontology builds upon E-CBR-O to represent and manage regulatory cases within its own regulatory case structure.

Incidents are events. An event is an incident if it is potentially disturbing the unobstructed functioning of a system. A regulatory document lists a collection of incidents of interest for a given life or work context. For each incident of interest, the document usually describes measures for prevention and measures for handling an occurring incident. To know, which incidents are actually of interest in a certain scenario and which measures are effectively applicable, is the result of experience collected in the past. A key to access this tacit knowledge is to identify parts of the document corresponding to incidents and measures, as well as to find a metric to make them comparable within a certain context. These considerations will be re ected in the case structure presented in the following

Measures are activites, that aim to prevent incidents or their consequences. Prentive measures are taken before incidents happen. Reactive measures are taken after incidents happen.