A Critique of the CAP Theorem (Papers We Love @ Seattle)
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The document critiques the CAP theorem, arguing that its definition of availability and consistency is too narrow. It suggests focusing instead on latency, service level agreements, and a spectrum of consistency options from linearizability to eventual consistency. Under certain network assumptions, all three of CAP - consistency, availability, and partition tolerance - can be achieved by prioritizing lower-latency coordination algorithms and distinguishing between local and global delays.
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evaluate paired sketching for engineering interactive systems, we conducted an experiment involving five pairs of stakeholders
who sketched a distributed user interface for inside-the-vehicule interaction distributed on four platforms: smartphone, tablet, pen display, and tabletop. Empirical results from questionnaires, reactivity, intention, perceived satisfaction, and free comments, suggest a preference order in which the tabletop is ranked first, followed by the tablet, smartphone, and pen display. Based on these results, we discuss the potential of paired sketching for distributed user interfaces.Relazione di laboratorio Idrolisi dell'amido (in inglese)
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John Steinbeck Popular Short Story
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Namun, alih-alih membawa kebahagiaan, mutiara itu justru menimbulkan keserakahan, kekerasan, dan penderitaan. Masyarakat di sekitarnya mulai menunjukkan niat jahat, dan bahkan keluarga Kino sendiri terjebak dalam konflik batin antara harapan dan kehancuran. Pada akhirnya, The Pearl menjadi simbol ironi: sesuatu yang tampak sebagai berkah berubah menjadi kutukan.
Melalui cerita ini, Steinbeck mengeksplorasi tema keserakahan, harapan, kemiskinan, dan ketimpangan sosial. Dengan gaya narasi yang lugas namun penuh makna simbolik, The Pearl menjadi refleksi tajam tentang sifat manusia dan dampak tragis dari keinginan yang tak terkendali.
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Grounded in behavioral science, consumer psychology, and cognitive design, this deck unpacks the key psychological drivers behind user motivation, decision-making, emotional engagement, and habit formation. From attention economics and dopamine-driven interactions to trust cues, loss aversion, and the paradox of choice you'll see how to harness what the mind naturally does to build digital products people dont just use they return to, talk about, and even advocate for.
Well explore:
Cognitive biases that shape user perception and choices and how to use them to your advantage without crossing ethical lines.
Emotional design principles that build trust, trigger desire, and turn features into feelings.
User behavior loops that build stickiness, deepen retention, and create emotional investments.
Psychological friction when to reduce it for conversion, and when to add it for intentionality.
Dark patterns vs. ethical persuasion the thin line between influence and manipulation.
A/B testing with a psychological lens learning not just what works, but why it works.
This is more than UX research or product marketing fluff. Its a call to build with empathy, backed by science, and sharpened by real-world product thinking. Whether youre shaping onboarding flows, gamifying engagement, designing pricing models, or rethinking retention strategies this deck will arm you with a new lens: the human mind.
Perfect for product managers, growth strategists, UX designers, behavioral scientists, and anyone serious about building products that resonate, retain, and inspire action.
Because at the heart of every great product is a human.
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science, any system of knowledge that is concerned with the physical world and its phenomena and that entails unbiased observations and systematic experimentation. In general, a science involves a pursuit of knowledge covering general truths or the operations of fundamental laws.
Science can be divided into different branches based on the subject of study. The physical sciences study the inorganic world and comprise the fields of astronomy, physics, chemistry, and the Earth sciences. The biological sciences such as biology and medicine study the organic world of life and its processes. Social sciences like anthropology and economics study the social and cultural aspects of human behaviour.
Science is further treated in a number of articles. For the history of Western and Eastern science, see science, history of. For the conceptualization of science and its interrelationships with culture, see science, philosophy of. For the basic aspects of the scientific approach, see physical science, principles of; and scientific method.
Model of a molecule. Atom, Biology, Molecular Structure, Science, Science and Technology. Homepage 2010 arts and entertainment, history and society
Britannica Quiz
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A Critique of the CAP Theorem (Papers We Love @ Seattle)
- 1. ACritiqueoftheCAPTheorem A paper by Martin Kleppmann @trevmex
- 2. Disclaimer Lets have a discussion. Ask questions. Make comments. Share ideas. @trevmex
- 3. TheBackground The CAP Theorem in brief: Pick two: Consistency Availability Partition Tolerance Formalized by Gilbert & Lynch in 2002. @trevmex
- 4. TheBeef Technically, Gilbert & Lynch are correct, but What they proof is silly. @trevmex
- 5. TheA Fox & Brewer say availability is a system-level concern. Gilbert & Lynch define it at an algorithm-level : For a distributed system to be continuously available, every request received by a non-failing node in the system must result in a response @trevmex
- 6. TheC Brewer calls consistency a spectrum. Gilbert & Lynch define it as the most strict type of consistency: linearizability : Linearizable distributed systems never allow for a stale read. @trevmex
- 7. TheP Partition tolerance means that a partition in the system (two parts of the system cannot communicate with each other) can be tolerated. What do we mean? Finite or infinite partitions? @trevmex
- 8. Fair-lossLinks A network link has the fair-loss property if the probability of a message not being lost is non-zero, i.e. the link sometimes delivers messages. The link may have intervals of time during which all messages are dropped, but those intervals must be of finite duration. I.e. Not Byzantine, no deliberately malicious messages. @trevmex
- 9. TheSilliness Gilbert & Lynchs proof shows that you can only not have linearizable and available distributed systems when there is the possibility of infinite partitions. If retry is possible, partitions are finite and latency is not a concern, you can have all three: CAP. @trevmex
- 10. ABetterWay Let's concentrate on latency and service level agreements, not consistency and availability. That means talking about delays.. @trevmex
- 11. Delay-sensitivity An algorithm is delay-sensitive if it need coordination to do a read or write action. Writes Reads Linearizability (e.g. The I in ACID) O(d) O(d) Sequential Consistency (e.g. Paxos, Sirius) O(d) O(1) Causal Consistency (i.e. non-related data may be out of order) O(1) O(1) @trevmex
- 12. WANvs.LANDelays A O(d) algorithm that only need coordination locally is cheaper than one that need coordination globally: O(dlocal) << O(dglobal) @trevmex
- 13. ANewThinking Availability is empirical (SLAs) Delay-sensitive means an algorithm must coordinate Network Faults (not just partitions) Fault Tolerance means when does it break (not infinite) Consistency is a spectrum (linearizability to eventual)@trevmex
- 14. Conclusion CAP was helpful in the beginning. But we can do better. Lets start with delay-sensitivity and SLAs. @trevmex