There is a batch of new products that do not meet the requirements. After inspection, the reasons for the failure are not due to poor quality of the raw materials or product design errors. Therefore, we believe that this batch of products is not due to the low level of workers' technical skills. What best supports the above conclusions are:. ['There are many factors affecting product quality.', 'The factory did not provide the necessary training for workers.', 'There are always many twists and turns in new products.', 'The product does not meet the requirements, either due to poor quality of raw materials or due to errors in product design, or due to low technical skills of workers.']