?ata???ste ta ßas??? st???e?a t?? d?a???µµat?? Ishikawa (ep?s?? ???st? ?? d????aµµa ?a?????a???, d????aµµa ?a?????a???, d????aµµa a?t???-ap?te??sµat?? ? Fishikawa) se µ???? 50 ?ept? µe a?t? t? p?a?t??? ?a? s???pt??? ß?ß???. ?? d????aµµa Ishikawa e??a? ??a ?s???? e??a?e?? d?a?e???s?? t?? p???t?ta? p?? ap?t??pe? ta sf??µata d?asfa?????ta? ?t? ?? ???ste? de? pa?aß??p??? ?aµ?a ap? t?? a?t?e? e??? p??ß??µat??. ??e??????e? ep?s?? t?? e?t?p?sµ? ?a? t?? a???????s? p??a??? ??se?? ??a t? p??ß??µa. ?? ß?ß??? a?t? sa? pa???e? µ?a e????st? e?sa???? st?? efa?µ???? t?? d?a???µµat?? Ishikawa st? d?a?e???s? ?????, t? d?a?e???s? ???d???? ?a? t?? ??e??? p???t?ta?. ?e???aµß??e? ep?s?? t?? e??tas? µ?a? µe??t?? pe??pt?s??, µ?a s???t?s? ??a t?? e??e??e?? t?? e??a?e??? ?a? t?? p??a??? pa??de? p?? p??pe? ?a ap?fe??????, ?a??? ?a? µ?a e?sa???? se s??af? µ??t??a, ?p?? ? µ???d?? t?? 5 Whys, t? d????aµµa Pareto ?a? ? µ???d?? CARRTDAF. 

S?et??? µe t? d????aµµa Ishikawa : ?? d????aµµa Ishikawa e??a? ??a ?pt??? e??a?e?? p?? pa???e? µ?a ep?s??p?s? t?? a?t??? ?a? t?? ap?te?esµ?t?? e??? p??ß??µat?? ?a? ep?t??pe? st??? ???ste? ?a ?atat????? a?t?? t?? a?t?e? ?a? ta ap?te??sµata ??a ?a p??sd????s??? µe a???ße?a t?? p???? t?? p??ß??µat??. ???s?µ?p??e?ta? ?????? ?? e??a?e?? ??a t? d?a?e???s? t?? p???t?ta? ? t? d?a?e???s? ?????, a??? e?de????ta? ep?s?? ?d?a?te?a ??a t? d?a?e???s? ???d????, ?a??? ep?t??pe? t?? p??ß?e?? ?a? t?? ep???s? t?? p??ß??µ?t??. Se a?t? t? ß?ß???, ?a a?a?a???ete p?? t? d????aµµa Ishikawa µp??e? ?a sa? ß????se?, ?a µ??ete ?a e?t?p??ete p??a??? a?t?e? p??ß??µ?t?? ?a? ?a a?a?a???ete p?? ?a ap??a??ptete t?? p??? ?p????d?p?te p??ß??µ?t?? st?? eta??e?a sa?. ??a saf?? e????s? t?? p?e??e?t?µ?t?? ?a? t?? p??a??? µe???e?t?µ?t?? t?? µe??d??, µ?a s???t?s? µ?a? p?a?t???? µe??t?? pe??pt?s?? ?a? µ?a e?sa???? se s??af? µ??t??a sa? d????? ta e??a?e?a p?? ??e???este ??a ?a p??sa?µ?sete t?? p??s????s? sa? st?? pe??pt?s? sa?.