certificazione volontaria

[kita_it]

Dear all,

here is the Italian sentence, taken from a Report by the Board of Auditors to the Shareholders' meeting:

"xxx, società incaricata del controllo contabile e della certificazione volontaria, nominata con atto del 15/08/2007"
My try:
"xxx, in charge of (the accounts) auditing and of the ???volontaria certification, appointed by act dated 08/15/2007"

I'm very uncertain about possible translations for "volontaria": voluntary? spontaneous? None sounds good to me, I need help!!

Thank you
Michelle

 

[jvalentini]

"X, the company entrusted with auditing and voluntary certification, was formally appointed on August 15, 2007.

 

[kita_it]

Thank you for your help!
In fact at first sight I had really no clue about this certification, now I understood it's the ISO-... certification that companies can decide to apply for.
Grazie