Although the TBT agreement applies to a wide range of industrial and agricultural products, health and plant health measures and procurement specifications are subject to separate agreements. The rules of the OBT agreement help distinguish between legitimate standards and technical rules and protectionist measures. Standards, technical rules and compliance assessment procedures must be developed and applied on a non-discriminatory basis, developed and applied in a transparent manner and, where appropriate, based on relevant international standards and guidelines. 6.3 Members are encouraged to be willing, at the request of other members, to enter into negotiations for mutual recognition agreements on the results of mutual compliance assessment procedures. Members may require these agreements to meet the criteria set out in paragraph 1 and to satisfy each other`s opportunities to facilitate trade in the products concerned. The CTA ensures that technical regulations, standards, testing and certification procedures do not create unnecessary trade barriers. The agreement prohibits technical requirements that are created to restrict trade, contrary to technical requirements created for legitimate purposes, such as consumer or environmental protection.  Its objective is to avoid unnecessary barriers to international trade and to recognize all WTO members in order to protect legitimate interests on the basis of their regulatory autonomy, although they encourage the application of international standards. The list of legitimate interests that may justify a trade restriction is not exhaustive and covers the protection of the environment, health and safety of people and animals.  In accordance with Article 1, this agreement applies to all industrial and agricultural products, with the exception of services, health and plant health measures (as defined in the agreement on the application of sanitary and plant health measures) and “purchase specifications established by public authorities for the production or consumption needs of public administrations” (Article 1.4).  – Members communicate demonstrations and mutual recognition agreements under the OBT agreement. Introduction to WTO rules on technical barriers to trade and understanding of the OTC agreement 10.7 When a member has reached an agreement with another country or country on issues relating to technical regulations, standards or compliance assessment procedures that could have a significant impact on trade, at least one member of the agreement informs other members of the , through the secretariat, food products covered by the agreement, and a brief description of the agreement.