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Dec...","frontmatter":{"category":"architecture","mental_models":["keep-options-open"],"related":["reversibility","premature-optimization"],"sources":["Fundamentals of Software Architecture"],"status":"draft","title":"Last Responsible Moment"},"id":"concept:last-responsible-moment","outgoing":["concept:last-responsible-moment--belongs-to--category:architecture--2520296ea5","concept:last-responsible-moment--derived-from--reference:fundamentals-of-software-architecture--b7724c7864","concept:last-responsible-moment--references--mental-model:keep-options-open--62d9780ed8","concept:last-responsible-moment--related-to--concept:premature-optimization--f4de15e5c6","concept:last-responsible-moment--related-to--concept:reversibility--7bca679664"],"path":"concepts/last-responsible-moment.md","slug":"last-responsible-moment","sourceRefs":["reference:fundamentals-of-software-architecture"],"title":"Last Responsible Moment","type":"concept","urlPath":"/concepts/last-responsible-moment/"},{"backlinks":["concept:blameless-postmortem--related-to--concept:latent-failures--a369e1cfa2","concept:change-introduces-new-failure-modes--related-to--concept:latent-failures--4c82cdf32d","concept:complexity--related-to--concept:latent-failures--fa0707872a","concept:defense-in-depth--related-to--concept:latent-failures--887691ad69","concept:degraded-mode-operation--related-to--concept:latent-failures--f1403a3194","concept:partial-failure--related-to--concept:latent-failures--de375423f0","mental-model:failure-is-normal--references--concept:latent-failures--cca793533d","reference:how-complex-systems-fail--links-to--concept:latent-failures--90e73e1199"],"categories":["systems"],"excerpt":"Complex systems always contain multiple flaws, each latent and individually insufficient to cause harm. 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Meadows ranks them from weak (adjusting parameters and numbers) to strong (changing rules, information flows, goals, and the paradigm the system arises from). Effort spent on low leverage poi...","frontmatter":{"category":"systems","mental_models":["constraints-govern-the-system"],"related":["stock-and-flow","feedback-loops","bounded-rationality","system-traps","bottlenecks","input-vs-output-metrics","toil","core-domain"],"sources":["Thinking in Systems"],"status":"draft","title":"Leverage Points"},"id":"concept:leverage-points","outgoing":["concept:leverage-points--belongs-to--category:systems--acd6340b5d","concept:leverage-points--derived-from--reference:thinking-in-systems--c98466a773","concept:leverage-points--references--mental-model:constraints-govern-the-system--21c919d681","concept:leverage-points--related-to--concept:bottlenecks--b1ba9da4aa","concept:leverage-points--related-to--concept:bounded-rationality--b98a75c1fe","concept:leverage-points--related-to--concept:core-domain--14d647e3fd","concept:leverage-points--related-to--concept:feedback-loops--82a31b3ed0","concept:leverage-points--related-to--concept:input-vs-output-metrics--4cfcb82f25","concept:leverage-points--related-to--concept:stock-and-flow--d47f009a5b","concept:leverage-points--related-to--concept:system-traps--d4cb2639db","concept:leverage-points--related-to--concept:toil--e8adb59297"],"path":"concepts/leverage-points.md","slug":"leverage-points","sourceRefs":["reference:thinking-in-systems"],"title":"Leverage Points","type":"concept","urlPath":"/concepts/leverage-points/"},{"backlinks":["concept:choice-architecture--related-to--concept:libertarian-paternalism--6b88327639","concept:nudge--related-to--concept:libertarian-paternalism--1296429677","mental-model:judgment-is-bounded--references--concept:libertarian-paternalism--cae7cf6570","reference:nudge--links-to--concept:libertarian-paternalism--c2b4c2c719"],"categories":["decision-making"],"excerpt":"The stance that it is legitimate, and often obligatory, to steer people toward choices that improve their own welfare (the paternalist half) while preserving their freedom to choose otherwise at low cost (the libertarian half). 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Choices are made relative to a reference point, and the pain of losing outweighs the pleasure of gaining the same amount. 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Natural mapping uses spatial or physical analogy so the correspondence is grasped immediately, like stove burners laid out in the same arrangement as their knobs. Good mapping lets people operate something correctly on the f...","frontmatter":{"category":"design","related":["affordances","discoverability"],"sources":["The Design of Everyday Things","Nudge"],"status":"draft","title":"Mapping"},"id":"concept:mapping","outgoing":["concept:mapping--belongs-to--category:design--dfd291d67a","concept:mapping--derived-from--reference:nudge--986ed1d733","concept:mapping--derived-from--reference:the-design-of-everyday-things--effe289eb6","concept:mapping--related-to--concept:affordances--e0a0d2ee16","concept:mapping--related-to--concept:discoverability--4c21bc6b93"],"path":"concepts/mapping.md","slug":"mapping","sourceRefs":["reference:nudge","reference:the-design-of-everyday-things"],"title":"Mapping","type":"concept","urlPath":"/concepts/mapping/"},{"backlinks":["concept:blameless-postmortem--related-to--concept:mechanisms--d9215ad723","concept:error-budgets--related-to--concept:mechanisms--9c7d9fec8a","concept:fitness-functions--related-to--concept:mechanisms--be509a3ffc","concept:forcing-functions--related-to--concept:mechanisms--56e5825003","concept:single-threaded-leadership--related-to--concept:mechanisms--1621b23e9e","mental-model:structure-drives-behavior--references--concept:mechanisms--8b1a8cc75d","reference:working-backwards--links-to--concept:mechanisms--15d30303ae"],"categories":["organizations"],"excerpt":"A complete, self reinforcing process that institutionalizes a desired behavior so it does not depend on people remembering or intending to do the right thing. \"Good intentions don't work; mechanisms do.\" A real mechanism has three parts: a tool, its adoption (so it is actually...","frontmatter":{"category":"organizations","mental_models":["structure-drives-behavior"],"related":["single-threaded-leadership","forcing-functions","fitness-functions","error-budgets","blameless-postmortem"],"sources":["Working Backwards"],"status":"draft","title":"Mechanisms"},"id":"concept:mechanisms","outgoing":["concept:mechanisms--belongs-to--category:organizations--3d2fa6b5ac","concept:mechanisms--derived-from--reference:working-backwards--9cdf8538c4","concept:mechanisms--references--mental-model:structure-drives-behavior--21136da785","concept:mechanisms--related-to--concept:blameless-postmortem--12b8805c79","concept:mechanisms--related-to--concept:error-budgets--ea2acc7b8c","concept:mechanisms--related-to--concept:fitness-functions--d07d62c663","concept:mechanisms--related-to--concept:forcing-functions--73818e4522","concept:mechanisms--related-to--concept:single-threaded-leadership--e2bbe18d81"],"path":"concepts/mechanisms.md","slug":"mechanisms","sourceRefs":["reference:working-backwards"],"title":"Mechanisms","type":"concept","urlPath":"/concepts/mechanisms/"},{"backlinks":["concept:complexity--related-to--concept:mutable-state--f5bdb2ea60","concept:declarative-programming--related-to--concept:mutable-state--f638badf84","concept:derived-data--related-to--concept:mutable-state--71123b96d6","concept:essential-vs-accidental-complexity--related-to--concept:mutable-state--8202abbf02","concept:referential-transparency--related-to--concept:mutable-state--3ec366f2cf","mental-model:complexity-is-the-root-cause--references--concept:mutable-state--35a2a9619a","reference:out-of-the-tar-pit--links-to--concept:mutable-state--d0dcb25dc6"],"categories":["complexity"],"excerpt":"State that changes over time, the values a system remembers between operations. Out of the Tar Pit identifies it as the single largest source of accidental complexity: once behavior depends on accumulated history, the number of states to reason about explodes, and the same inp...","frontmatter":{"category":"complexity","mental_models":["complexity-is-the-root-cause"],"related":["complexity","essential-vs-accidental-complexity","referential-transparency","declarative-programming","derived-data"],"sources":["Out of the Tar Pit"],"status":"draft","title":"Mutable State"},"id":"concept:mutable-state","outgoing":["concept:mutable-state--belongs-to--category:complexity--203e1c9906","concept:mutable-state--derived-from--reference:out-of-the-tar-pit--ffcc3e342c","concept:mutable-state--references--mental-model:complexity-is-the-root-cause--7961fb4bc0","concept:mutable-state--related-to--concept:complexity--4559778c68","concept:mutable-state--related-to--concept:declarative-programming--18a63325bf","concept:mutable-state--related-to--concept:derived-data--15f997a68d","concept:mutable-state--related-to--concept:essential-vs-accidental-complexity--dbfa86864d","concept:mutable-state--related-to--concept:referential-transparency--43e3f89a87"],"path":"concepts/mutable-state.md","slug":"mutable-state","sourceRefs":["reference:out-of-the-tar-pit"],"title":"Mutable State","type":"concept","urlPath":"/concepts/mutable-state/"},{"backlinks":["concept:cognitive-load--related-to--concept:naming--3e64b0a292","concept:comments-capture-design-knowledge--related-to--concept:naming--e057365aaf","concept:obvious-code--related-to--concept:naming--abb4980cc6","concept:ubiquitous-language--related-to--concept:naming--681b46a5c7"],"categories":["design"],"excerpt":"A name is a tiny abstraction. A good name creates a precise, accurate image of the thing it refers to and quietly excludes what it is not. 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The argument must stand on its own in complete sentences, with reasoning and evidence, rather than as fragments a...","frontmatter":{"category":"organizations","related":["working-backwards","comments-capture-design-knowledge"],"sources":["Working Backwards"],"status":"draft","title":"Narrative Memos"},"id":"concept:narrative-memos","outgoing":["concept:narrative-memos--belongs-to--category:organizations--f485eb59c0","concept:narrative-memos--derived-from--reference:working-backwards--833ad33342","concept:narrative-memos--related-to--concept:comments-capture-design-knowledge--df777c4e7e","concept:narrative-memos--related-to--concept:working-backwards--c8383035b2"],"path":"concepts/narrative-memos.md","slug":"narrative-memos","sourceRefs":["reference:working-backwards"],"title":"Narrative Memos","type":"concept","urlPath":"/concepts/narrative-memos/"},{"backlinks":["concept:choice-architecture--related-to--concept:nudge--88d7e3851c","concept:default-options--related-to--concept:nudge--9386902c56","concept:libertarian-paternalism--related-to--concept:nudge--c0e18d2dc8","concept:structuring-complex-choices--related-to--concept:nudge--3edb0a3b10","reference:nudge--links-to--concept:nudge--9b90767197"],"categories":["decision-making"],"excerpt":"Any feature of choice architecture that predictably alters people's behavior without forbidding any options or significantly changing their economic incentives. To count as a nudge, the intervention must be easy and cheap to avoid: a default you can change, not a mandate; a re...","frontmatter":{"category":"decision-making","related":["choice-architecture","default-options","libertarian-paternalism","structuring-complex-choices"],"sources":["Nudge"],"status":"draft","title":"Nudge"},"id":"concept:nudge","outgoing":["concept:nudge--belongs-to--category:decision-making--7114858e0e","concept:nudge--derived-from--reference:nudge--e2c9c1bf3c","concept:nudge--related-to--concept:choice-architecture--fb11ef6737","concept:nudge--related-to--concept:default-options--9e67002a9a","concept:nudge--related-to--concept:libertarian-paternalism--1296429677","concept:nudge--related-to--concept:structuring-complex-choices--5de504973a"],"path":"concepts/nudge.md","slug":"nudge","sourceRefs":["reference:nudge"],"title":"Nudge","type":"concept","urlPath":"/concepts/nudge/"},{"backlinks":["concept:fail-fast--related-to--concept:observability--deb8bdcd98","concept:feedback-loops--related-to--concept:observability--4a3a22f66c","concept:service-level-objectives--related-to--concept:observability--2f2e392a0b","concept:toil--related-to--concept:observability--7e06efea64","mental-model:verification-over-authorship--references--concept:observability--c52f389ede","reference:site-reliability-engineering--links-to--concept:observability--59d96c7611"],"categories":["systems"],"excerpt":"Observability is the degree to which a system's internal health can be inferred from what it emits: metrics, logs, and traces. You cannot operate, debug, or improve what you cannot see. The practical core is to instrument for a small set of user centric signals (latency, traff...","frontmatter":{"category":"systems","mental_models":["verification-over-authorship"],"related":["service-level-objectives","feedback-loops","fail-fast","toil"],"sources":["Site Reliability Engineering"],"status":"draft","title":"Observability"},"id":"concept:observability","outgoing":["concept:observability--belongs-to--category:systems--ef04f51349","concept:observability--derived-from--reference:site-reliability-engineering--d0a58a9c50","concept:observability--references--mental-model:verification-over-authorship--9c61cd612d","concept:observability--related-to--concept:fail-fast--39f57b7f37","concept:observability--related-to--concept:feedback-loops--18ee1ee501","concept:observability--related-to--concept:service-level-objectives--1eb60ecc23","concept:observability--related-to--concept:toil--7226a4f44b"],"path":"concepts/observability.md","slug":"observability","sourceRefs":["reference:site-reliability-engineering"],"title":"Observability","type":"concept","urlPath":"/concepts/observability/"},{"backlinks":["concept:cognitive-ease--related-to--concept:obvious-code--4514e65bb8","concept:comments-capture-design-knowledge--related-to--concept:obvious-code--46d2e70f8e","concept:conceptual-model--related-to--concept:obvious-code--88ff3e597a","concept:design-it-twice--related-to--concept:obvious-code--ebda28c818","concept:discoverability--related-to--concept:obvious-code--752cf32dd1","concept:naming--related-to--concept:obvious-code--34aa7e6d35","concept:programming-by-coincidence--related-to--concept:obvious-code--f2a62b97f1","mental-model:design-for-understanding--references--concept:obvious-code--53b4af7fd4","reference:a-philosophy-of-software-design--links-to--concept:obvious-code--56f56297f0"],"categories":["design"],"excerpt":"Code is obvious when a reader can understand what it does and why with little effort, forming a correct mental model on the first read and rarely being surprised. 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Code is read far more often than it is written, and obviousness is a property judged...","frontmatter":{"category":"design","mental_models":["design-for-understanding"],"related":["comments-capture-design-knowledge","naming","design-it-twice","discoverability","conceptual-model","cognitive-ease","programming-by-coincidence"],"sources":["A Philosophy of Software Design"],"status":"draft","title":"Obvious Code"},"id":"concept:obvious-code","outgoing":["concept:obvious-code--belongs-to--category:design--4352d97f4e","concept:obvious-code--derived-from--reference:a-philosophy-of-software-design--b08b1e81ff","concept:obvious-code--references--mental-model:design-for-understanding--a03fe5f78d","concept:obvious-code--related-to--concept:cognitive-ease--02bbcc19aa","concept:obvious-code--related-to--concept:comments-capture-design-knowledge--8d63f59c22","concept:obvious-code--related-to--concept:conceptual-model--e968982371","concept:obvious-code--related-to--concept:design-it-twice--0f573ec62f","concept:obvious-code--related-to--concept:discoverability--949b7f9cef","concept:obvious-code--related-to--concept:naming--abb4980cc6","concept:obvious-code--related-to--concept:programming-by-coincidence--75c1e615ec"],"path":"concepts/obvious-code.md","slug":"obvious-code","sourceRefs":["reference:a-philosophy-of-software-design"],"title":"Obvious Code","type":"concept","urlPath":"/concepts/obvious-code/"},{"backlinks":["concept:connascence--related-to--concept:orthogonality--9223231918","concept:coupling-and-cohesion--related-to--concept:orthogonality--20592dbaa3","concept:deep-modules--related-to--concept:orthogonality--2bed9fd4c2","concept:dry-principle--related-to--concept:orthogonality--3bb4b19ddc","concept:information-hiding--related-to--concept:orthogonality--5219a9fb80","concept:reversibility--related-to--concept:orthogonality--6340a0dd3e","mental-model:keep-options-open--references--concept:orthogonality--370379e249","pattern:modular-boundaries--references--concept:orthogonality--c1b62509d6","reference:the-pragmatic-programmer--links-to--concept:orthogonality--17752493e3"],"categories":["architecture"],"excerpt":"Two components are orthogonal when changing one has no effect on the other. 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The system stays stuck while everyone strains harder. 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No cause is needed; the pattern is statistical. People invent causal stories for what is just regression, crediting or blaming interventions that did nothing. 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It arises from multiple contributing conditions combining, none individually sufficient. Naming one \"root cause\" is a choice driven by the need for closure, not by the structure of the failure. 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It is not a one dimensional label a system simply \"has\"; it is a question: if load grows in a specific way, what are our options for handling it? 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Two directions matter: backward compatibility (new code can read data written by old code) and forward compatibility (old code can read data written by new code). Both are needed wheneve...","frontmatter":{"category":"architecture","mental_models":["keep-options-open"],"related":["reversibility","derived-data"],"sources":["Designing Data-Intensive Applications"],"status":"draft","title":"Schema Evolution"},"id":"concept:schema-evolution","outgoing":["concept:schema-evolution--belongs-to--category:architecture--7e56d9807c","concept:schema-evolution--derived-from--reference:designing-data-intensive-applications--a4f03b9294","concept:schema-evolution--references--mental-model:keep-options-open--c36da602d0","concept:schema-evolution--related-to--concept:derived-data--216b0498d7","concept:schema-evolution--related-to--concept:reversibility--368e638c0c"],"path":"concepts/schema-evolution.md","slug":"schema-evolution","sourceRefs":["reference:designing-data-intensive-applications"],"title":"Schema Evolution","type":"concept","urlPath":"/concepts/schema-evolution/"},{"backlinks":["concept:complexity--related-to--concept:second-system-effect--9809b0b375","concept:conceptual-integrity--related-to--concept:second-system-effect--4dc5243a39","concept:essential-vs-accidental-complexity--related-to--concept:second-system-effect--a85d3ac37d","concept:plan-to-throw-one-away--related-to--concept:second-system-effect--42e880ef2a","reference:the-mythical-man-month--links-to--concept:second-system-effect--7c2249c583"],"categories":["architecture"],"excerpt":"The second system a designer builds is the most dangerous, because success with a lean first system breeds the confidence to over engineer the second, cramming in every feature and embellishment that was wisely left out before. 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The quick fix is attracti...","frontmatter":{"category":"systems","related":["delays","system-traps"],"sources":["Thinking in Systems"],"status":"draft","title":"Shifting the Burden"},"id":"concept:shifting-the-burden","outgoing":["concept:shifting-the-burden--belongs-to--category:systems--2e1e9b425d","concept:shifting-the-burden--derived-from--reference:thinking-in-systems--2e47ccbac3","concept:shifting-the-burden--related-to--concept:delays--a33ece4b54","concept:shifting-the-burden--related-to--concept:system-traps--650b58c192"],"path":"concepts/shifting-the-burden.md","slug":"shifting-the-burden","sourceRefs":["reference:thinking-in-systems"],"title":"Shifting the Burden","type":"concept","urlPath":"/concepts/shifting-the-burden/"},{"backlinks":["concept:affordances--related-to--concept:signifiers--b2aa011812","concept:discoverability--related-to--concept:signifiers--ba726b6cc5","concept:feedback--related-to--concept:signifiers--c2c0529647","mental-model:design-for-understanding--references--concept:signifiers--271d429bfe","reference:the-design-of-everyday-things--links-to--concept:signifiers--9e6cfa85df"],"categories":["design"],"excerpt":"A signifier is any perceivable signal that communicates where and how an action should take place: a label, an icon, a visible cue. Where affordances determine what is possible, signifiers communicate it. People act on what they perceive, not on what is possible. A door with a...","frontmatter":{"category":"design","related":["affordances","discoverability","feedback"],"sources":["The Design of Everyday Things"],"status":"draft","title":"Signifiers"},"id":"concept:signifiers","outgoing":["concept:signifiers--belongs-to--category:design--d010e5b6b1","concept:signifiers--derived-from--reference:the-design-of-everyday-things--8ea136697a","concept:signifiers--related-to--concept:affordances--1c9c1c6180","concept:signifiers--related-to--concept:discoverability--f0735733ef","concept:signifiers--related-to--concept:feedback--db3d3b6ad1"],"path":"concepts/signifiers.md","slug":"signifiers","sourceRefs":["reference:the-design-of-everyday-things"],"title":"Signifiers","type":"concept","urlPath":"/concepts/signifiers/"},{"backlinks":["concept:conways-law--related-to--concept:single-threaded-leadership--603ad2045c","concept:mechanisms--related-to--concept:single-threaded-leadership--e2bbe18d81","concept:team-first-thinking--related-to--concept:single-threaded-leadership--826e0ca7bc","reference:working-backwards--links-to--concept:single-threaded-leadership--5a53c3e6fd"],"categories":["organizations"],"excerpt":"Assigning one person, supported by a dedicated and largely autonomous team, to own a single initiative and nothing else. 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Because a few slow requests dominate the worst experiences, and often hit the most active, most valuable users, the tail is the number that matters. 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Team...","frontmatter":{"category":"organizations","patterns":["modular-boundaries","context-mapping"],"related":["team-interaction-modes","information-hiding"],"sources":["Team Topologies"],"status":"draft","title":"Team API"},"id":"concept:team-api","outgoing":["concept:team-api--belongs-to--category:organizations--32cf0be496","concept:team-api--derived-from--reference:team-topologies--afecb03f15","concept:team-api--references--pattern:context-mapping--4c9968d44a","concept:team-api--references--pattern:modular-boundaries--edc43e6856","concept:team-api--related-to--concept:information-hiding--c6c0b9e3c5","concept:team-api--related-to--concept:team-interaction-modes--162748c58f"],"path":"concepts/team-api.md","slug":"team-api","sourceRefs":["reference:team-topologies"],"title":"Team API","type":"concept","urlPath":"/concepts/team-api/"},{"backlinks":["concept:cognitive-load--related-to--concept:team-first-thinking--b39a8e76bf","concept:four-fundamental-team-types--related-to--concept:team-first-thinking--1634db1eff","concept:generative-culture--related-to--concept:team-first-thinking--de87589118","concept:single-threaded-leadership--related-to--concept:team-first-thinking--c2c178b1f8","reference:team-topologies--links-to--concept:team-first-thinking--58dfa4c1d9"],"categories":["organizations"],"excerpt":"The team, not the individual, is the fundamental unit of software delivery. 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