puter-programs-spring-2005/453216e53b2225221a756bf42bfdcd3d_PEwZL3H2oKg.pdf#page=16" title="SICP Lecture 3A transcript, page 16">Abelson</a></span></p>
</blockquote>
<ul>
<li>With the top-down tree, each part does a specific task.</li>
<li>In the Henderson example, we had a full range of linguistic power at each level. Each level did a whole range of things, not a single task.</li>
<li>This makes the system more robust: easier to adapt to changes.</li>
<li>A small change in the top-down tree might cause the