It does not require explicit fault models or bug catalogues for its operation, but instead reasons from a representation of the correct behavior of the system to be diagnosed.

• 它不要求获得清晰的故障模型或错误目录，而是从待诊断系统的正常行为描述出发进行推理。 更确切地是，设备行为的基于模型诊断与设备模型的行为预测是相对的。