A notebook on UX, product, and the details that shape an experience. By João Ferrão.https://uxsnack.com/en-UShttps://uxsnack.com/en/posts/observability-in-agentic-ux/https://uxsnack.com/en/posts/observability-in-agentic-ux/When the agent works in the background, trust dies. How Claude Code solved it, and what you can copy.Sat, 25 Apr 2026 00:00:00 GMTDesign for AIAI AgentsUXHuman-AI InteractionJoão Ferrãohttps://uxsnack.com/en/posts/capability-discovery-in-agentic-ux/https://uxsnack.com/en/posts/capability-discovery-in-agentic-ux/People don't know what AI can do. It's one of the biggest UX challenges for AI products today, and there are concrete patterns that work.Wed, 15 Apr 2026 00:00:00 GMTDesign for AIAI AgentsUXHuman-AI InteractionJoão Ferrãohttps://uxsnack.com/en/posts/multi-agent-orchestration-for-designers/https://uxsnack.com/en/posts/multi-agent-orchestration-for-designers/Seven patterns for coordinating multiple AI agents, and what each one asks of the interface.Thu, 26 Mar 2026 00:00:00 GMTDesign for AIAI AgentsUXProduct DesignJoão Ferrãohttps://uxsnack.com/en/posts/prompt-engineering-as-design-work/https://uxsnack.com/en/posts/prompt-engineering-as-design-work/Two years ago this was an engineering job. Today, designers write prompts side by side with data science. Five patterns and a reverse-engineering trick that changes everything.Wed, 04 Mar 2026 00:00:00 GMTDesign for AIUXProduct DesignHuman-AI InteractionJoão Ferrãohttps://uxsnack.com/en/posts/deterministic-to-probabilistic-design/https://uxsnack.com/en/posts/deterministic-to-probabilistic-design/For 60 years we designed for predictable screens. AI broke that. What changes in the method when the output is no longer fixed.Thu, 12 Feb 2026 00:00:00 GMTDesign for AIUXProduct DesignHuman-AI InteractionJoão Ferrãohttps://uxsnack.com/en/posts/mental-models-for-ai-design/https://uxsnack.com/en/posts/mental-models-for-ai-design/Co-pilot, Assistant, Learning Partner: three ways people understand AI, and how each one changes the interface you'll design.Tue, 20 Jan 2026 00:00:00 GMTDesign for AIHuman-AI InteractionUXProduct DesignJoão Ferrãohttps://uxsnack.com/en/posts/inclusive-design-team/https://uxsnack.com/en/posts/inclusive-design-team/A team's internal culture shows up in the product it ships. How to build a team that produces inclusive design by default.Tue, 16 Dec 2025 00:00:00 GMTInclusionMentorshipProduct DesignUXJoão Ferrãohttps://uxsnack.com/en/posts/cultural-sensitivity-product-design/https://uxsnack.com/en/posts/cultural-sensitivity-product-design/Symbols, colours, dates, and references carry different meanings in different cultures. How to catch this before the product ships.Tue, 04 Nov 2025 00:00:00 GMTInclusionUXProduct DesignAccessibilityJoão Ferrãohttps://uxsnack.com/en/posts/inclusive-forms-design/https://uxsnack.com/en/posts/inclusive-forms-design/Before adding a field, ask whether it's necessary. When it is, there are ways to ask that include more people.Tue, 30 Sep 2025 00:00:00 GMTInclusionUXProduct DesignAccessibilityJoão Ferrãohttps://uxsnack.com/en/posts/ehealth-telemedicine-mhealth/https://uxsnack.com/en/posts/ehealth-telemedicine-mhealth/The three terms overlap but aren't equivalent. Telling them apart changes what you research, who you talk to, and what regulation applies.Wed, 13 Aug 2025 00:00:00 GMTDesign for HealthUXProduct DesignJoão Ferrãohttps://uxsnack.com/en/posts/accessibility-beyond-contrast/https://uxsnack.com/en/posts/accessibility-beyond-contrast/Colour and font are just the start. Cognitive accessibility, screen readers, dyslexia: what changes when you broaden the lens.Wed, 09 Jul 2025 00:00:00 GMTAccessibilityInclusionUXProduct DesignJoão Ferrãohttps://uxsnack.com/en/posts/inclusive-language-in-design/https://uxsnack.com/en/posts/inclusive-language-in-design/Small word swaps that change who feels welcome in the product. A practical list for emails, copy, research scripts, and UI.Thu, 22 May 2025 00:00:00 GMTInclusionUXProduct DesignAccessibilityJoão Ferrãohttps://uxsnack.com/en/posts/design-thinking-in-healthcare/https://uxsnack.com/en/posts/design-thinking-in-healthcare/The five phases stay five phases. But Empathise weighs more, Define gets slower, Ideate becomes co-design, and Test happens with people for whom mistakes cost more.Tue, 08 Apr 2025 00:00:00 GMTDesign for HealthResearchUXProduct DesignJoão Ferrãohttps://uxsnack.com/en/posts/the-agentic-era-what-this-means-for/https://uxsnack.com/en/posts/the-agentic-era-what-this-means-for/Is "Agentic Era" a new term for you? Let’s get you up to speed.Fri, 21 Feb 2025 00:00:00 GMTDesign for AIAI AgentsUXProduct DesignAI EthicsJoão Ferrãohttps://uxsnack.com/en/posts/grice-maxims-conversational-design/https://uxsnack.com/en/posts/grice-maxims-conversational-design/Four 1975 principles about what makes a conversation work. Applied to health chatbots, they're one of the best evaluation rubrics I know.Tue, 04 Feb 2025 00:00:00 GMTDesign for HealthDesign for AIHuman-AI InteractionUXJoão Ferrãohttps://uxsnack.com/en/posts/5-human-ai-interaction-types-the/https://uxsnack.com/en/posts/5-human-ai-interaction-types-the/Thinking about all the Human-AI interaction possibilities allows us to innovate and avoid falling back on the easiest solutions that we think are ‘shiny’ for users.Thu, 19 Dec 2024 00:00:00 GMTUXHuman-AI InteractionDesign for AIJoão Ferrãohttps://uxsnack.com/en/posts/designing-with-patients-not-for-them/https://uxsnack.com/en/posts/designing-with-patients-not-for-them/Recruitment, consent, remote sessions, ethics. What changes when your participants live with a chronic condition.Tue, 12 Nov 2024 00:00:00 GMTDesign for HealthResearchUXProduct DesignJoão Ferrãohttps://uxsnack.com/en/posts/principios-eticos-no-design-para/https://uxsnack.com/en/posts/principios-eticos-no-design-para/It’s crucial to follow fundamental principles to ensure ethics in AI design.Wed, 16 Oct 2024 00:00:00 GMTDesign for AIAI EthicsJoão Ferrãohttps://uxsnack.com/en/posts/patient-care-journeys/https://uxsnack.com/en/posts/patient-care-journeys/The IBS case shows what happens when designers map the actual path of someone living with a chronic condition. Lessons for any health design work.Sun, 15 Sep 2024 00:00:00 GMTDesign for HealthResearchUXProduct DesignJoão Ferrãohttps://uxsnack.com/en/posts/measuring-the-success-of-user-experience/https://uxsnack.com/en/posts/measuring-the-success-of-user-experience/Thu, 29 Aug 2024 00:00:00 GMTUXResearchUsability TestingJoão Ferrãohttps://uxsnack.com/en/posts/making-workshops-accessible/https://uxsnack.com/en/posts/making-workshops-accessible/Making co-design workshops accessible is key to ensuring the participation of everyone involved.Wed, 14 Aug 2024 00:00:00 GMTAccessibilityWorkshopsDesign for HealthJoão Ferrãohttps://uxsnack.com/en/posts/template-gratuito-analise-heuristica/https://uxsnack.com/en/posts/template-gratuito-analise-heuristica/This is a free template for you to start your Heuristic AnalysisMon, 22 May 2023 00:00:00 GMTHeuristic EvaluationUXProduct DesignWorkshopsUsability TestingJoão Ferrãohttps://uxsnack.com/en/posts/the-famous-product-trio/https://uxsnack.com/en/posts/the-famous-product-trio/The term ‘product trio’ refers to the core team involved in creating a digital product. This concept was explored by Teresa Torres in her book ‘Continuous Discovery Habits.’ Typically, this trio consiFri, 10 Mar 2023 00:00:00 GMTProduct TrioProduct DesignResearchJoão Ferrãohttps://uxsnack.com/en/posts/biodesign-healthcare-practice/https://uxsnack.com/en/posts/biodesign-healthcare-practice/Biodesign is a design approach that uses biology and the life sciences as an inspiration and resource for innovation in various fields, including health.Thu, 16 Feb 2023 00:00:00 GMTDesign for HealthBiodesignJoão Ferrãohttps://uxsnack.com/en/posts/presenting-design-an-important-skill/https://uxsnack.com/en/posts/presenting-design-an-important-skill/Presenting your own work isn't optional, it's part of being a designer. How to prepare, deliver, and receive feedback without losing yourself in the process.Mon, 30 Jan 2023 00:00:00 GMTPresentingProduct DesignJoão Ferrãohttps://uxsnack.com/en/posts/how-to-do-storymapping/https://uxsnack.com/en/posts/how-to-do-storymapping/Story mapping is a method for organising user stories, allowing a holistic view of the entire experience.Fri, 13 Jan 2023 00:00:00 GMTStory MappingProduct DesignUser StoriesWorkshopsPersonasJoão Ferrãohttps://uxsnack.com/en/posts/product-designers-and-research/https://uxsnack.com/en/posts/product-designers-and-research/Product design should never be totally separated from the research phase. When this happens, there is a gap between what has been learnt and what is being designed.Fri, 02 Dec 2022 00:00:00 GMTProduct DesignResearchUXJoão Ferrãohttps://uxsnack.com/en/posts/how-to-prepare-usability-tests/https://uxsnack.com/en/posts/how-to-prepare-usability-tests/We can't exactly predict how someone will use a particular interface, so testing becomes an important phase of any projectFri, 11 Nov 2022 00:00:00 GMTUsability TestingUXResearchCognitive BiasesJoão Ferrãohttps://uxsnack.com/en/posts/the-crucial-need-for-designing-for-aging/https://uxsnack.com/en/posts/the-crucial-need-for-designing-for-aging/According to the 2018 Ageing report that Público reinforces, only 4.2 million people will be of working age (2), and so we are moving towards a new paradigm.Mon, 07 Nov 2022 00:00:00 GMTAgeingDesign for HealthUXAccessibilityJoão Ferrãohttps://uxsnack.com/en/posts/cognitive-biases-explained/https://uxsnack.com/en/posts/cognitive-biases-explained/Cognitive biases are shortcuts our brain uses to process information. Which ones matter most for product design, and how to mitigate them in practice.Wed, 02 Nov 2022 00:00:00 GMTCognitive BiasesInclusionAI EthicsUXJoão Ferrão