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    <h2>I am pretty unsure if my explanation and example really cover the most important principles</h2> <p>Think of behavior as scenarios external to the structures. A certain data structure can "be used" in multiple behaviors/scenarios.</p> <p>On the other hand think of structure related logic as being internal to the structure. The structure gets affected by various changes and executes some actions as a consequence.</p> <p>That being said we can exemplify with the following:</p> <p>Structure design patterns will define a weblog by defining its constituents as higher level business objects such as Article/Image/Comment. The constituents are aware of one another and how to connect to each other.</p> <pre><code>$image = new Image; $image-&gt;title = 'Image title'; $image-&gt;url = 'http://example.com/file.ext'; $image-&gt;save(); // will save the image to a DB $article-&gt;title = 'The title i have set'; /* $article-&gt;url_key = 'the_title_i_have_set'; */ // this ^^ element of logic will be done automatically by the article $article-&gt;addImage($image); // will save the connection between the // article and the image to DB </code></pre> <p>Behavior design patterns will define a weblog by its use cases (scenarios) using lower level business objects such as Article/ArticleToImage/Image/ArticleToComment. The business objects are not aware of each other and are "maneuvered" into place by the scenario logic.</p> <pre><code>$image = new Image; $image-&gt;title = 'Image title'; $image-&gt;url = 'http://example.com/file.ext'; $image-&gt;save(); // will save the image to a DB $article-&gt;title = 'The title i have set'; $article-&gt;url_key = $controller-&gt;getURlKey($article-&gt;title); $article-&gt;save(); // saves article to DB $article_to_image = new ArticleToImage; $article_to_image-&gt;article = $article; $article_to_image-&gt;image = $image; $article_to_image-&gt;save(); </code></pre> <hr> <h2>TL;DR</h2> <p>If the storage objects are smart (contain logic) that's structural design. If the storage objects are dumb (they can only store data and transfer it to the DB) you then need a behavioral design to manage them.</p>
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    1. COStill didnt understood the difference
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