Has done research on the trait of cadel of caused by hereditary factor. Cadel is the inability say letter "r" in adults, it can also be caused by disease factors, psikoedukatif and psikokultural. This study began in 1994 and then discontinued in 2012. Because of herediter factor not yet been known surely, so that this research aim to determine the nature of cadel which influence by herediter and to determine the inheritance pattern of cadel. As many as three pedigree research that has been compiled from the data that meet the criteria are analyzed to determine the nature of cadel caused by hereditary factors and determine the inheritance pattern of a cadel. Made an assumption that "Character A pattern revealed by b" in determining the inheritance pattern cadel, then through phenotypic found in the pedigree is determined assuming compliance. The results showed that cadel can also be caused by hereditary factors with autosomal recessive inheritance pattern
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