Information from each certified firm was crossed with the information from the other firms and later it was triangulated with data obtained by means of interviews held with two members of driving organizations, two consultants, two auditors and a member of technical committee ISO/TC207 who was the chief of the standard ISOI4006 elaboration.
La información de cada empresa clasiicada se cruzó con la del resto de empresas y se trianguló con la obtenida a través de las entrevistas con dos miembros de organizaciones tractoras, dos consultores, dos auditores y un miembro del comité técnico ISO/TC207 encargado de la elaboración de la ISO14006.