A synthesis of retrospectives and failure cases from 3 perspectives. yitang Truman's in-depth retrospective (5 parts + 5-step method + 5 principles + 4 levels + AAR + quotes from Wang Xing / Liu Chuanzhi / Chairman Mao + Yu Lu's 5-year retrospective of Someet) / Wang Kai's 11 firsthand product failure lessons (FastFacts SEC / AiPathly / Quanta Quest / WhatsApp push / MJ for Feishu / AI smoking cessation / Squirrel Quick Read) + 6 failure modes / Xiaohongshu vibecoding pitfalls (0-80 vs 80-100 / Vibe Coding cleanup prophecy). Covers AAR 4 questions, 4-layer retrospective, 6 major categories of failure modes, and hidden pitfalls of Vibe Coding
Yitang's mandatory course for all staff: First Lesson on In-Depth Review, delivered by Truman. "An organization capable of producing high-quality reviews can basically do everything well" (Wang Xing). It covers 5 parts (building negative aesthetic / understanding value / advanced improvement / high-level application / re-understanding) + the 5-step review method (sort out the process → review goals → evaluate results → analyze causes → summarize lessons) + 5 major principles (seeking truth from facts / open mind / self-reflection / candid expression / drawing on collective wisdom) + 4 levels of review (entry-level post-event chat / beginner-level process sorting / intermediate-level structured analysis / advanced-level growth-oriented reflection) + cases including Mao Zedong as an educator / Su Yu / Liu Chuanzhi / AAR, etc. Comes with candy: Yu Lu's 5-year in-depth review case from Someet + a full-web research report on review tools
