Test frequency and results. 2.1. The frequency of testing to the requirements of paragraphs 1.1. to 1.5. and 1.7. above shall be on a statistically controlled and random basis in accordance with one of the regular quality assurance procedure, and shall be conducted at least once per year. 2.2. Minimum conditions for the control of conformity of Enhanced Child Restraint Systems of categories "Universal", "Semi Universal" and "Restricted", in relation to the dynamic tests according to paragraph 1.6. above. In accordance with the relevant authorities, the holder of an approval will supervise the control of conformity following the method of batch control (para. 2.2.1. below) or following the method of continuous control (para. 2.2.2. below). 2.2.1. Batch control for the Enhanced Child Restraint Systems 2.2.1.1. The holder of an approval shall divide the Enhanced Child Restraint Systems into batches which are as uniform as possible in regard to raw material or intermediate products involved in their manufacture (different colour of shell, different manufacture of harness) and in regard to production conditions. The numbers in a batch shall not exceed 5,000 units. In agreement with the relevant authorities the tests can be carried out by the Technical Service or under the responsibility of the holder of an approval. 2.2.1.2. A sample shall be taken in each batch in accordance with the provisions of paragraph 2.2.1.4. below from a minimum of 20 per cent of the batch quantity, which has to be produced of the actual batch. 2.2.1.3. The characteristics of the Enhanced Child Restraint Systems and the number of dynamic tests to be conducted are given in paragraph 2.2.1.4. below. 2.2.1.4. In order to be accepted, a batch of Enhanced Child Restraint Systems shall satisfy the following conditions. Number in the batch Number of samples/ Enhanced Child Restraint Systems characteristics Combined number of samples Acceptance criteria Rejection criteria Degree of control rigour
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Sources: Regulation Concerning the Adoption of Uniform Technical Prescriptions for Wheeled Vehicles, Regulation No. 129, Regulation No. 129