
Measles Chart Basics
The clever Dr. John Snow mapped cholera cases during the epidemic of 1854 on a street map of the area. This type of mapping now called a measles chart, or defect location check sheet, or defect map, is useful when exploring the effect of location data.
The name measles chart may have come from the habit of using an image of drawing of a product and adding small red dots to signify defect locations.



Would you spend $100 every week to prevent a possible issue that will result in a loss of $10? Probably not, so why is that we do that with our maintenance programs every single day? Often, PM and PdM activities are put into place without any thought to the economic impact of the activity. While in theory the PM or PdM activities will prevent or mitigate the consequences of the failure, is implementing one of these activities the right thing to do?





If you are lucky enough to have good failure data history in your CMMS, you are one of the few. But even if you have the data, can you use it to make a difference to your organization? Obviously, the data can be used to perform certain reliability engineering analyses, but what can those without reliability engineering experience do with the data?
