These indicators describe the behavior of a Weibull distribution, and are analog to shape and scale factors.

The **m** indicator (the median) corresponds to the point in time where reliability is at 50% becoming an easy to locate measure of central tendency, based on the data or office automation tools available.

The **R2m** indicator corresponds to the reliability after 0.5 from the median, i.e., the probability value on the reliability curve of **m** plus 50% of itself.