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nexus/sreweekly/articles/448/06-if-you-don-t-examine-what-worked-how-will-you-know-what-works.html
2026-09-12 17:23:01 +08:00

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<h1 class="entry-title">If you don&#8217;t examine what worked, how will you know what&nbsp;works?</h1> </header><!-- .entry-header --> <div class="entry-meta">
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<a href="https://surfingcomplexity.blog/author/lorinh/" rel="author">Lorin Hochstein</a> </span>
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<a href="https://surfingcomplexity.blog/category/systems/incidents/" rel="category tag">incidents</a>, <a href="https://surfingcomplexity.blog/category/resilience/" rel="category tag">resilience</a>, <a href="https://surfingcomplexity.blog/category/systems/" rel="category tag">systems</a> </span><!-- .cat-links -->
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<time class="entry-date published" datetime="2024-10-17T18:52:31-07:00">October 17, 2024</time><time class="updated" datetime="2024-10-17T18:57:10-07:00">October 17, 2024</time> </span>
<span class="word-count">4 Minutes</span> </div><!-- .entry-meta -->
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<p class="wp-block-paragraph">This is one of my favorite bits from fellow anglophone Québécois Norm McDonald:</p>
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<span class="embed-youtube" style="text-align:center; display: block;"><iframe class="youtube-player" width="1100" height="619" src="https://www.youtube.com/embed/6wDendRefm0?version=3&#038;rel=1&#038;showsearch=0&#038;showinfo=1&#038;iv_load_policy=1&#038;fs=1&#038;hl=en&#038;autohide=2&#038;wmode=transparent" allowfullscreen="true" style="border:0;" sandbox="allow-scripts allow-same-origin allow-popups allow-presentation allow-popups-to-escape-sandbox"></iframe></span>
</div><figcaption class="wp-element-caption">Norm: not a lung expert</figcaption></figure>
<p class="wp-block-paragraph">One of the goals I believe that we all share for post-incident work is to <em>improve</em> the system. For example, when I wrote the post <a href="/2024/09/28/why-i-dont-like-discussing-action-items-during-incident-reviews/">Why I don&#8217;t like discussing action items during incident reviews</a>, I understood why people would want to focus on action items: precisely because they share this goal of wanting to improve the system (As a side note, Chris Evans of <a href="https://incident.io/">incident.io</a> wrote a response: <a href="https://incident.io/blog/why-i-like-discussing-actions-items-in-incident-reviews">Why I like discussing actions items in incident reviews</a>). However, what I want to write about here is not the discussion of action items, but focusing on what went wrong versus what went right.</p>
<h3 class="wp-block-heading">&#8220;How did things go right?&#8221;</h3>
<p class="wp-block-paragraph"><em>How did things go right</em> is a question originally posed by the safety researcher Erik Hollnagel, in his the safety paradigm that he calls Safety-II. The central idea is that things <em>actually go right</em> most of the time, and if you want to actually improve the system, you need to get a better understanding of how the system functions, which means you need to broaden your focus beyond the things that broke. </p>
<p class="wp-block-paragraph">You can find an approachable introduction to Safety-II concepts in the <a href="https://www.eurocontrol.int/">EUROCONTROL</a> white paper <a href="https://www.skybrary.aero/bookshelf/books/2437.pdf">From Safety-I to Safety-II</a>. Hollnagel&#8217;s ideas have been very influential in the resilience engineering community. As an example, check out my my former colleague Ryan Kitchens&#8217;s talk at SREcon Americas 2019: <a href="https://www.usenix.org/conference/srecon19americas/presentation/kitchens">How Did Things Go Right? Learning More from Incidents</a>.</p>
<p class="wp-block-paragraph">It&#8217;s with this <em>how did things go right</em> lens that I want to talk a little bit about incident review.</p>
<h3 class="wp-block-heading">Beyond &#8220;what went well&#8221;</h3>
<p class="wp-block-paragraph">Now, in most incident writeups that I&#8217;ve read, there is a &#8220;what went well&#8221; section. However, it&#8217;s typically the smallest section in the writeup, with maybe a few bullet points: there&#8217;s never any real detail there. </p>
<p class="wp-block-paragraph">Personally, I&#8217;m looking for details like how an experienced engineer recognized the symptoms enough to get a hunch about where to look next, reducing the diagnostic time by hours. Or how engineers leveraged an operational knob that was originally designed for a different purpose. I want to understand how experts are able to do the work of effectively diagnosing problems, mitigating impact, and remediating the problem. </p>
<p class="wp-block-paragraph">Narrowly, I want to learn this because I want to get this sort of working knowledge into other people&#8217;s heads. More broadly, I want to bring to light the actual work that gets done.</p>
<h3 class="wp-block-heading">We don&#8217;t know how the system works</h3>
<figure class="wp-block-embed is-type-rich is-provider-twitter wp-block-embed-twitter"><div class="wp-block-embed__wrapper">
<div class="embed-x"><blockquote class="twitter-tweet" data-width="550" data-dnt="true"><p lang="en" dir="ltr">Humans adapt to the constraints they face in order to get their work done. Look for these adaptations if you want to understand the work better.</p>&mdash; @norootcause.surfingcomplexity.com on Bluesky (@norootcause) <a href="https://x.com/norootcause/status/1845495552483762451?ref_src=twsrc%5Etfw">October 13, 2024</a></blockquote><script async src="https://platform.x.com/widgets.js" charset="utf-8"></script></div>
</div></figure>
<p class="wp-block-paragraph">Safety researchers make a distinction between <a href="https://humanisticsystems.com/2020/10/28/proxies-for-work-as-done-1-work-as-imagined/"><em>work-as-imagined</em> and <em>work-as-done</em></a>. We <em>think</em> we understand how the day-to-day work gets done, but we actually don&#8217;t. Not really. To take an example from software, we don&#8217;t actually know how people really use the tooling to get their work done, and I can confirm this by being on-call for internal support for development tools in previous jobs. (&#8220;You&#8217;re using our tool to do <em>what?&#8221;</em> is not an uncommon reaction from the on-call person). People do things we never imagined, in both wonderful and horrifying ways (sometimes at the same time!). </p>
<p class="wp-block-paragraph">We also don&#8217;t see all of the ways that people coordinate to get their work done. There are the meetings, the slack messages, the comments on the pull requests, but there&#8217;s also the shared understanding, the <em>common knowledge</em>, the stuff that everybody knows that everybody else knows, that enables people to get this work done, while reducing the amount of explicit communication that has to happen.</p>
<p class="wp-block-paragraph">What&#8217;s remarkable is that these work patterns, well, they work. These people in your org are able to get their stuff done, almost all of the time. Some of them may exhibit mastery of the tooling, and others may use the tooling in ways even it was never intended that are fundamentally unsafe. But we&#8217;re never going to actually know unless we actually look at how they&#8217;re doing their work.</p>
<p class="wp-block-paragraph">Because how people do their work is <em>how the system works</em>. And if we&#8217;re going to propose and implement interventions, it&#8217;s very likely that the outcomes of the interventions will surprise us, because these changes might disrupt effective ways of doing work, and people will adapt to those interventions in ways we never anticipated, and in ways we may never even know if we don&#8217;t take a look. </p>
<h3 class="wp-block-heading">Then why use incidents to look at things that go right?</h3>
<p class="wp-block-paragraph">At first glance, it does seem odd to use incidents as the place to examine where work goes well: given that incidents are times where something unquestionably went wrong. It would be wonderful if we could study how work happens when things are going well. Heck, I&#8217;d love to see companies have sociologists or anthropologists on staff to study how the work happens at the company. Regrettably, though, incidents are one of the only times when the organization is actually willing to devote resources (specifically, time) on examining work in fine-grained detail.</p>
<p class="wp-block-paragraph">We can use incidents to study how things go well, but we have to keep a couple of things in mind. One, we need to recognize that adaptations that fail led to an incident are <em>usually successful</em>, which is why people developed those adaptations. Note that because an adaptation usually works, doesn&#8217;t mean that it&#8217;s a good thing to keep doing: an adaptation could be a dangerous workaround to a constraint like a third-party system that can&#8217;t be changed directly and so must be awkwardly worked around. </p>
<p class="wp-block-paragraph">Second, we need to look in more detail, to <em>remark</em>, at incident response that is remarkable. When incident response goes well, there is impressive diagnostic, coordination, and improvisation work to get the system back to healthy. These are the kinds of skills you want to foster across your organization. If you want to build tools to make this work even better, you should take the time to understand just how this work is done today. Keep this in mind when you&#8217;re proposing new interventions. After all, if you don&#8217;t examine what worked, how will you know what works?</p>
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