This Guide is intended to help producers to prepare clear and concise certificates to accompany certified reference materials. Such certificates, while maintaining their essential character, should help to provide, in summary form, all the information needed by the user of the reference. material.

• Year of Declaration: 2009
• Reference: ISO Guide 31: 2000
• Number of Pages: 7
• Code: GYS 457
• Version:
• ICS Number: 71.040.30