Its primary aim is to avoid duplication of ( potentially conflicting ) standards between CEN and ISO .
The Vienna Agreement was signed by CEN and the International Organization for Standardization ( ISO ) in 1991 but came in force in the mid-2000s .
CEN 's primary aim is to avoid duplication of ( potentially conflicting ) standards CEN CEN and ISO .
The Vienna Agreement was signed by CEN and the International Organization for Standardization ( ISO ) in 1991 but came in force in the mid-2000s .