“Now that you are measuring open, click, and conversion rates for your emails, it's time to look at how to improve them. Let's talk about A/B testing, sometimes called split testing. Far too many people hear A/B testing and think button colors and small wording changes.”
Saumil Mehta, former CPO of Square, argues that the "skip lead" (the manager of managers) is pivotal to organizational health, since most manager problems trace back to how the skip leads hires, reviews, and coaches…
Lenny Rachitsky, introducing a guest post by Colin on AI leverage for product managers, argues that PM work is shifting from coordination toward hands-on building with AI. The post lays out three ladders of leverage…
Teresa Torres shares answers from the Q&A of her webinar on building AI evals for the Interview Coach, a teaching tool that gives students feedback on their customer interviews. She explains her lean, hands-on tooling…
Teresa Torres addresses a recurring question from product teams: who should count as a customer for interviews in continuous discovery. She argues that a customer is whoever uses the product or makes the purchase…
A guest post by product leader Tamara Hinckley offering a step-by-step playbook for building a parental leave coverage plan. It walks through timing the rollout with stakeholders, choosing a leave timeline, assigning…
This podcast episode features three members of Musubi, an AI-native trust and safety toolkit for content platforms, discussing how they build custom-trained ML models and LLM-powered moderation tools tailored to each…
John Cutler reflects on the growing role of AI in product and team work, framing it as something that can play several supporting roles: a scribe that captures notes, a thought partner that challenges ideas, a tool that…
Guest author Olga Berezovsky explains the difference between correlation and linear regression analysis for product teams. Correlation measures how strongly two variables move together on a scale from -1 to 1, and is a…
Torres argues that all-time totals, like lifetime registered users, are rarely useful because they only go up and hide whether a product is improving or declining. The right measure depends on choosing a time increment…
Teresa Torres explains that she began building AI products with no team to lean on, and that hands-on work with Claude Code is how she and other product people are building the skills needed for AI product work. She…
Lenny Rachitsky answers a reader who must deliver bad news after inheriting a six-month onboarding overhaul that performed worse on metrics than the old flow. He argues the key is imagining you are the decision-maker…
Brian Ta, a former SEO lead at Airbnb, Strava, and AngelList, explains how to run SEO experiments on sites with thousands of programmatic pages. He argues SEO tests must be bucketed at the page level rather than the…
Teresa Torres explains "context rot," the pattern where large language model performance degrades as the context window fills up with conversation history and input. Drawing on recent research (Liu et al. 2023, Paulsen…
Teresa Torres walks through the building blocks of Claude Code: markdown context files, slash commands, agents and sub-agents, skills, hooks, and plug-ins. Her core argument is that going deep on one tool and…
Teresa Torres recounts how a worm known as Mini Shai-Hulud, which spread through popular JavaScript packages in May, pushed her to rethink the security of her AI-assisted building. She explains that most malware follows…
Teresa Torres responds to recent supply-chain attacks on software packages by describing how she hardens her local machine while still letting Claude access many folders for her task and research system. She recaps the…
Teresa Torres introduces a multi-week series arguing that API teams need more product discovery, and aims to bridge API engineers and discovery practitioners. This installment explains the basics: what an API is, how…
Lenny Rachitsky shares a product-and-brand guide compiled with builder-investor Justin Mares, covering health-focused choices for sleep, clothing, food, supplements, toxin mitigation, and everyday items. The core…
A paid newsletter post summarizing Lenny Rachitsky's podcast conversation with SEO expert Ethan Smith. It explains the three main types of SEO, contrasts contextual and navigational internal links, and argues that…
Marty Cagan's first published article, from a 1986 HP Journal issue, is a technical overview of Hewlett-Packard's internal AI Workstation research program and its first product, a Common Lisp development environment. It…