 Mr. Face was best known for his role in the 1970s, 80s and 90s in the development of the technologies and the design/installation practices that became the world standard for the specification, control and measurement of the flatness and levelness of concrete.The Face Floor Profile Numbering System ("F-Numbers") has been adopted by the American Concrete Institute, the American Society for Testing and Materials, the Canadian Standards Association, the World Bank and is more widely used with each passing year.A system that is a slight modification of F-Numbers is used in much of Europe.