In order play the guarantee and control role provided for by law 580/93, the Chambers of Commerce are responsible for the collection, assessment and review of practices. These are defined by the law as general and repeated behaviours adopted by the community for a long period of time, with the conviction of obeying to a mandatory juridical prescription. They represent a source of law, taken as a reference point failing any specific provision, or when explicit references are made to them.
Each Chamber has a Provincial Practice Commission and a number of Technical Committees in charge of carrying out assessments and reviews.
The Commission consists of the representatives of trading associations, professional associations and legal experts; for each sector, a suitable technical committee is established, and it is made up of people appointed by trading and consumer associations, whereas secretarial functions are performed by a Chambers officer.

A copy of the Collection is sent to the Municipalities, in order to be posted up in the municipal Roll together with a poster inviting the business categories, experts, and professional associations concerned to put forward their proposals. After 45 days of posting date, during which people are allowed to make documented and motivated remarks and propose amendments or integrations, the Commission, based on the work carried out by single Committees, draws up the collection project and submits it to the Chambers council for approval. This procedure ends with the publication of a volume, which is available for consultation and is updated every five years; it helps private citizens, provincial business operators and entrepreneurs in carrying out effective implementation.