Adoption process of the si system by all the worlds nations is called

Adoption process of the SI system by all the worlds nations is called Metrication or metrification.

Metrication or metrification is defined as conversion to the metric system of units of measurement. Earlier, many traditional and local systems were used for conversion but since last 2 centuries, most of the countries have adopted the SI system that is widely used as system of measurement.

okay i have so many questions. but the big one here is: um wt..f is this mess? ?