1. According to the specification model. Such as each specification are certified, both costly and time-consuming, so the same purpose, a variety of different specifications of the product, one or two representative of the optional certification. Such as 1-100 kilowatts of the motor, you can do so.
2, according to the special requirements of users, a product  to do certification. Such as: industrial switches, according to user comments, manufacturers of products and the original design of the product differences, according to user requirements to do certification.
3, the certification of large equipment. Such as large-scale equipment is divided into several enterprises, can be assembled together in the assembly site for certification.
4, according to the human brain, physical field test. Such as children can not open the drug packaging cover.