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-But with so many patterns, how do we choose a pattern? So
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-this is a possible approach that you can follow. First of all, you
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-want to make sure that you understand your design context. You understand
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-what you're designing and what are the issues involved with this design. What
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-are the problems that you need to solve. At this point, you
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-can examine the patterns catalog, or,if
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-you're already familiar with the catalog, just
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-think about the possible patterns that you could use. Once you identify
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-the patterns that you can use, you also want to study them and
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-study the related patterns. So normally if you look at any pattern catalog,
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-for each pattern there will also be a list of related patterns. So
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-you can also look at those to see whether maybe some of those
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-might be more applicable. And finally, once you identify the pattern that you
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-think is appropriate, you will apply that pattern. When you do that, just
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-be mindful that there are pitfalls in the use of patterns. One obvious
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-one is the fact that you might select the wrong pattern and make
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-your design worse instead of better. The second one is that if you
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-get too excited about patterns, then you
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-might be abusing patterns, so just using too
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-many patterns, and end up with a design
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-that is more complicated rather than less complicated.
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-So always be careful, spend the time to figure out which one is the right
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-pattern to apply, and make sure that you
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-don't use patterns that you don't actually need.