Group 1: Product Quality Control Changes - Before obtaining STC certification, the product quality control was relatively lax, with less than 10 pesticide residue detection items, failing to meet high-quality market demands [2] - After obtaining STC certification, the quality control system underwent a fundamental transformation, expanding detection items to over 30, including various trace elements and increasing pesticide detection to over 50 types [4] - The return rate due to quality issues decreased by 60% in the first sales cycle after certification, and consumer satisfaction increased from 65% to 90% [4] Group 2: Sales Channel Changes - Prior to certification, sales channels were limited, relying mainly on local distributors and covering fewer than 10 cities, resulting in lower average prices [6] - Post-certification, sales channels expanded significantly, with online sales through live streaming increasing monthly sales by 30%-40% and entry into major supermarket chains raising average prices by 5-8 yuan per kilogram [6] Group 3: Promotion Model Changes - Before certification, the promotion model was simplistic, participating in only 2-3 regional fairs annually, with minimal order amounts [8] - After obtaining certification, the promotion model diversified, participating in international agricultural exhibitions and attracting over 20 buyers, resulting in intention orders worth 2 million yuan [8]