Cat
Cat reliability presents a complex analytical challenge. In terms of physical presence, a cat proves remarkably reliable—it will be somewhere in the dwelling approximately 16 to 20 hours daily, accounting for outdoor excursions in non-apartment configurations. However, the reliability of specific behaviours remains profoundly uncertain. A cat summoned will likely not appear; a cat that appeared yesterday at feeding time may not appear today. The cat operates according to internal scheduling algorithms inaccessible to human analysis.
Microwave
The microwave oven demonstrates exceptional operational reliability. A quality unit will function for seven to ten years with minimal maintenance, activating precisely when its door is closed and start button pressed. It does not experience mood variations, health fluctuations, or unexplained absences. The two-minute timer means precisely two minutes, every engagement. When a microwave fails, it fails completely and obviously, rather than offering partial or unpredictable service.