In 2019, three sub-projects were carried out in the quality problem tracking project, and different degrees of achievement were made in the quality problem improvement of delivery, the improvement of PDI problem and the improvement of process quality problem.<br>Quality improvement of delivery quality: 19 issues were resolved after the removal of duplicate issues, and by the end of 2019, 16 issues had been closed, with the remaining 3 issues having been specifically improved;<br>PDI quality issue improvement: a total of 5 issues, as of the end of 2019, a total of 4 closed issues, the remaining 1 issue has been applied for extension, the current progress is normal;<br>Improvement of process quality issues: a total of 52 issues, as of the end of 2019, a total of 29 closed questions, the remaining 23 questions, of which 20 issues are progressing normally, 3 issues are moving slowly.
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