to improve the former data collection (status quo): to understand the current situation, to do a good job status survey. In the current situation investigation, should be based on the actual situation, the application of different QC tools (such as questionnaire, arrangement, etc.), data collection and collation;
H) to find out the main reason: after the cause analysis and data collection, many kinds of reasons, the use of Platon, arranged in different analysis methods, according to the 80/20 rule, to find out the main reason;