Selection using EBVs is a more advanced selection method. It uses the same phenotype measurements described above for aspects of health, behavior, and performance, but it then combines those measurements in a second step that includes pedigree relationships. The numeric value produced by this second step estimates each dog’s relative genetic worth as a breeder for a particular trait or characteristic. These estimates are known as estimated breeding values (EBVs), and they are the most accurate way known to describe the genetic potential of each young dog as a possible breeder. Key to producing accurate EBVs is to begin the process with accurately recorded pedigree relationships and accurately measured phenotypes on most dogs in a population.