Parts Per Million (PPM)

When Motorola developed the Six Sigma concept a realisation that technology would change the way we need to think about quality and especially about manufacturing non-conformance rates occurred. With automated processes responsible for much of current manufacturing, quality levels should be very high and this supposition bought about a change to what is acceptable in terms of non-conformance to agreed quality levels. That change was to move from expressing and measuring quality levels in percentages of parts per hundred to one of measuring defects level in terms of Parts Per Million.

For more information on Parts Per Million (PPM), click here.