http://everything2.com/?node=New%20Writeups%20Atom%20Feed&foruser=SteppinRazor 2002-10-25T12:05:53Z http://everything2.com/user/SteppinRazor/writeups/CRCSteppinRazorhttp://everything2.com/user/SteppinRazor2002-10-25T12:05:53Z2002-10-25T12:05:53Z <p>It is an acronym for <a href="/title/Class-Responsibility-Collaboration">Class-Responsibility-Collaboration</a>, too.</p> <p>This comes from an technique used in Object-Oriented Analysis and Design (<a href="/title/OOAD">OOAD</a>) called 'CRC-cards'. CRC-cards were invented by <a href="/title/Ward+Cunningham">Ward Cunningham</a> (he got famous for inventing the <a href="/title/wiki">wiki</a>) and <a href="/title/Kent+Beck">Kent Beck</a> in the late 80ies. They were working at Tektronix (Portland, Oregon) back then.</p> <p>How does it work? You use small cards of which each one represents a <a href="/title/class">class</a>. Instead of writing <a href="/title/attributes">attributes</a> and <a href="/title/methods">methods</a> on that card, you put <a href="/title/responsibilities">responsibilities</a> and <a href="/title/collaborations">collaborations</a> on it.<br> A responsibility is a description of the classes purpose on a higher level.<br> A collaboration is understood as the class(or the classes), which is (are) necessary to fulfill the responsibility.</p> <p>The main advantage of CRC-cards is, that they can be rearranged and reordered very easily. If you and your teammate have to discuss something regarding the class-model of your application, it is easier to use the cards then to draw large diagrams&hellip;