--- title: “We Are 90% Done” Is the Most Expensive Sentence in... description: The phrase '90% done' is deceptive in software delivery because it measures visible code completion, not actual shippability. The final 10% routinely contains... canonical: https://daily.dev/posts/we-are-90-done-is-the-most-expensive-sentence-in-software-delivery-oogko37h4 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: “We Are 90% Done” Is the Most Expensive Sentence in Software Delivery | daily.dev og:description: The phrase '90% done' is deceptive in software delivery because it measures visible code completion, not actual shippability. The final 10% routinely contains... og:url: https://daily.dev/posts/we-are-90-done-is-the-most-expensive-sentence-in-software-delivery-oogko37h4 og:image: https://api.daily.dev/og/posts/ooGKo37h4.png og:image:alt: “We Are 90% Done” Is the Most Expensive Sentence in Software Delivery og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # “We Are 90% Done” Is the Most Expensive Sentence in Software Delivery **[Medium](https://daily.dev/sources/medium_js)** · 6 min read · 23 upvotes · 2 comments ## Summary The phrase '90% done' is deceptive in software delivery because it measures visible code completion, not actual shippability. The final 10% routinely contains edge cases, real-data bugs, third-party integration failures, client sign-off, and deployment/rollback procedures — often representing 40–50% of the real effort. The recommended fix is to replace percentage-based progress reporting with a binary 'done-done' standard: a feature is only done when it's deployed to production, verified on real data, and signed off by someone other than the builder. Tracking shippable slices ('8 of 12 features live') instead of vague percentages gives teams an auditable, honest view of progress. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Community discussion Top comments from developers on daily.dev. **@pdfopsdev** · 6 upvotes > This is basically Cargill's 90-90 rule — the first 90% of the code takes 90% of the time, and the remaining 10% takes the other 90%. The deeper reason percentages lie: they track the part you can see, lines written, and are blind to the part you can't — integration, real-data edge cases, rollback. Binary done-done works because it's the only definition that includes the invisible half. **@bits\_and\_bytes** · 0 upvotes > Nothing wrong in my POV, when we need to deliver multiple features with no bandwidth. ## Similar posts on daily.dev - [Why Is Everything in Software Always 90% Done?](https://daily.dev/posts/why-is-everything-in-software-always-90-done--bwqukhza4) · Medium · 0 upvotes · 0 comments - [Blog: Shipping Code Is Not the Job](https://daily.dev/posts/blog-shipping-code-is-not-the-job-glt1yhy9e) · Wawandco · 2 upvotes · 1 comments --- Tags: [#agile](https://daily.dev/tags/agile), [#project-management](https://daily.dev/tags/project-management) [View this post on daily.dev](https://daily.dev/posts/we-are-90-done-is-the-most-expensive-sentence-in-software-delivery-oogko37h4) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"“We Are 90% Done” Is the Most Expensive Sentence in Software Delivery","url":"https://daily.dev/posts/we-are-90-done-is-the-most-expensive-sentence-in-software-delivery-oogko37h4","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/we-are-90-done-is-the-most-expensive-sentence-in-software-delivery-oogko37h4"},"datePublished":"2026-07-12T09:53:32.565Z","dateModified":"2026-09-14T09:14:51.222Z","description":"The phrase '90% done' is deceptive in software delivery because it measures visible code completion, not actual shippability. 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The deeper reason percentages lie: they track the part you can see, lines written, and are blind to the part you can’t — integration, real-data edge cases, rollback. 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