It is necessary to establish minimum standards for the accessibility of different services provided by public and private enterprises for persons with different types of impairments. Reference tools such as the ITU-T recommendation Telecommunications Accessibility Checklist for standardization activities (2006) and the Telecommunications accessibility guidelines for older persons and persons with disabilities (ITU-T recommendation F.790) should be mainstreamed whenever a new ICT-related standard is developed. That would allow the generalization of universal design in the development of standards. States parties should establish a legislative framework with specific, enforceable, time-bound benchmarks for monitoring and assessing the gradual modification and adjustment by private entities of their previously inaccessible services into accessible ones. States parties should also ensure that all newly procured goods and services are fully accessible for persons with disabilities. Minimum standards must be developed in close consultation with persons with disabilities and their representative organizations, in accordance with article 4, paragraph 3, of the Convention. The standards can also be developed in collaboration with other States parties and international organizations and agencies through international cooperation, in accordance with article 32 of the Convention. States parties are encouraged to join ITU study groups in the radiocommunication, standardization and development sectors of the Union, which actively work at mainstreaming accessibility in the development of international telecommunications and ICT standards and at raising industry's and governments' awareness of the need to increase access to ICT for persons with disabilities. Such cooperation can be useful in developing and promoting international standards that contribute to the interoperability of goods and services. In the field of communication-related services, States parties must ensure at least a minimum quality of services, especially for the relatively new types of services, such as personal assistance, sign language interpretation and tactile signing, aiming at their standardization.