Many of us wish metrication would go away and just not bother us. All over the world when people have had to face this change in their measurement system their first reaction has been to call it a problem. When the voluntary but coordinated system was undertaken in Australia early in the 1970's many people took the attitude that the change was an insurmountable problem. But I would like to tell Americans that this alleged problem is one the greatest opportunities the community has had. Let me explain. Metrication involves changing every number or datum that is based on customary measurement. This will provide the greatest single built-in mechanism for review we have ever had. It will be an opportunity for: reducing unnecessary variety in sizes of products; taking a second look at all the standards, regulations, requirements, codes, and technical bases we have been using; simplifying, streamlining, getting rid of bottlenecks; and coordinating standards by instituting a single datum where several- or even several hundred- are now in use. There are four ways by which metrication will help sift out unnecessary measurement, calculations and practices from our current nonmetric technology. These are simplification, rationalization, harmonization, and standardization. Simplification will come about because every unit within the metric system is coherent. Rationalization can become widely possible because we can introduce an industry-wide system of preferred dimensions and preferred coordinated sizes that link the advantages of the decimal measurement system to the advantages of reducing variety. Harmonization of building codes and standards can take place as part of the changeover. And standardization, both nationally and internationally, is a vehicle for the description of preferred characteristics for a wide range of physical conditions, products, or performance.