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   <h1 class="title">What is Software Engineering?</h1>
 
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-Brian Loudin 
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 <h1>Lecture 2: What is Software Engineering?</h1>
 
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 <p><strong>Software engineering</strong> differs from <strong>programming</strong> in dimensionality: programming is about producing code. Software engineering extends that to include the maintenance of that code for its useful life span.</p>
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 <p>There is a factor of at least <strong>100,000 times</strong> between the life spans of short-lived code and long-lived code. It is silly to assume that the same best practices apply universally on both ends of that spectrum.</p>
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 <p>Software is sustainable when, for the expected life span of the code, we are <strong>capable of responding to changes</strong> in dependencies, technology, or product requirements. We may choose to not change things, but we need to be capable.</p>
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 <h2>Hyrum’s Law</h2>
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 <p><em>“With a sufficient number of users of an API,</em> <em>it does not matter what you promise in the contract:</em> <em>all observable behaviors of your system</em> <em>will be depended on by somebody.”</em></p>
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 <p>Every task your organization has to do repeatedly should be scalable (linear or better) in terms of human input. Policies are a wonderful tool for making process scalable.</p>
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 <p>Process inefficiencies and other software-development tasks tend to scale up slowly. Be careful about boiled-frog problems.</p>
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 <p>Expertise pays off particularly well when combined with economies of scale.</p>
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 <p><strong>Because I said so</strong> is a terrible reason to do things.</p>
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 <p>Being data driven is a good start, but in reality, most decisions are based on a mix of data, assumption, precedent, and argument. It’s best when objective data makes up the majority of those inputs, but it can rarely be all of them.</p>
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 <p>Being data driven over time implies the need to change directions when the data changes (or when assumptions are dispelled). Mistakes or revised plans are inevitable.</p>
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