1, fault reproduction method: that is, restore the fault and measure the parts of the product, first look at the consistency and conformity of the analyzed product from the measurement data, and then measure and analyze the related parts;
2. Data analysis: There are seven commonly used tools, such as Plato, fishbone diagram and brainstorming. The possible influencing factors can be listed from five aspects: people, machine, law, things and environment. Establish Plato, and determine the main reasons through statistical analysis of data;
3. Decompose the main factors through experiments, establish improvement points, and then specify measures to implement;
4. The analysis report can be made by 8D method, which is more comprehensive.