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A BI challenges the sterilization process with viable spores selected for resistance to the method being assessed. Carriers are positioned in difficult-to-reach or colder areas of a load, then incubated after the cycle. No growth within the specified readout period indicates a pass; growth signals a possible cycle failure and calls for reprocessing and investigation. Rapid-readout systems detect spore enzyme activity to provide results sooner. The lesson also introduces resistance measures such as D-value and z-value, and notes that standards define BI design and performance. Routine monitoring frequency depends on the sterilizer and load type, with implantable-device loads receiving particular attention.