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<p>The preventative solution to this problems is to try to design architecture up front, mitigating the various risks that come from cross-cutting concerns (defects, low modifiability, etc.) (<a href="#fairbanks">Fairbanks 2010</a>). A popular method in the 1990's was the <a href="https://en.wikipedia.org/wiki/Unified_Modeling_Language">Unified Modeling Language</a> (UML), which was a series of notations for expressing the architectural design of a system before implementing it. Recent studies show that UML generally not used and generally not universal (<a href="#petre">Petre 2013</a>). More recent developers have investigated ideas of <b>architectural styles</b>, which are patterns of interactions and information exchange between encapsulated components. Some common architectural styles include:</p>
<ul>
<li><em>Client/server</em>, in which data is transacted in response to requests. This is the basis of the Internet and cloud computing (<a href="#cito">Cito et la. 2015</a>).</li>
<li><em>Pipe and filter</em>, in which data is passed from component to component, and transformed and filtered along the way. Command lines, compilers, and machine learned programs are examples of pipe and filter architectures.</li>
<li><em>Model-view-controller (MVC)</em>, in which data is separated from views of the data and from manipulations of data. Nearly all user interface toolkits use MVC, including popular modern frameworks such as React.</li>
<li><em>Peer to peer (P2P), in which components transact data through a distributed standard interface. Examples include Bitcoin, Spotify, and Gnutella.</em>
<li><em>Event-driven</em>, in which some components "broadcast" events and others "subscribe" to notifications of these events. Examples include most model-view-controller-based user interface frameworks, which have models broadest change events to views, so they may update themselves to render new model state.</p>
<li><strong>Client/server</strong>, in which data is transacted in response to requests. This is the basis of the Internet and cloud computing (<a href="#cito">Cito et la. 2015</a>).</li>
<li><strong>Pipe and filter</strong>, in which data is passed from component to component, and transformed and filtered along the way. Command lines, compilers, and machine learned programs are examples of pipe and filter architectures.</li>
<li><strong>Model-view-controller (MVC)</strong>, in which data is separated from views of the data and from manipulations of data. Nearly all user interface toolkits use MVC, including popular modern frameworks such as React.</li>
<li><strong>Peer to peer (P2P)</strong>, in which components transact data through a distributed standard interface. Examples include Bitcoin, Spotify, and Gnutella.</em>
<li><strong>Event-driven</strong>, in which some components "broadcast" events and others "subscribe" to notifications of these events. Examples include most model-view-controller-based user interface frameworks, which have models broadest change events to views, so they may update themselves to render new model state.</p>
</ul>
<p>Architectural styles come in all shapes and sizes. Some are smaller design patterns of information sharing (<a href="#beck">Beck et al. 2006</a>), whereas others are ubiquitous but specialized patterns such as the architectures required to support undo and cancel in user interfaces (<a href="#bass">Bass et al. 2004</a>).</p>