Routine checking is a systematic process of examining an item or system to ensure that it is functioning properly and is in good condition. It usually involves a regular inspection, testing, or maintenance to identify any potential problems or to confirm that the item or system is working as it should. Examples of routine checking include checking the oil and fluid levels in a car, inspecting electrical wiring, and testing fire alarms.
In contrast, spot checking is a process of randomly checking an item or system to identify any potential problems or verify that it is working correctly. Spot checking is used to check items or systems that are not regularly examined in a routine check. It is usually conducted when changes to the item or system have been made, or if there is reason to suspect that there may be a problem. Examples of spot checking include testing the brakes on a car after they have been serviced, inspecting a new piece of equipment for safety, and testing a fire alarm after it has been installed.