The International Standards may berevised from time to time by the WADA Executive Committee afterreasonable consultation with the Signatories and governments.Unless provided otherwise in the Code , International Standardsand all revisions shall become effective on the date specified in theInternational Standard or revision.MODELS  OF  BEST  PRACTICEModels of Best Practice based on the Code will be developed toprovide state of the art solutions in different areas of anti-doping.The Models will be recommended by WADA and made availableto Signatories upon request but will not be mandatory.