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While working on my current project I decided that I had a need to use the Specification Pattern . After finding a clean implementation by Jeff Perrin I set to work creating the specifications that I needed. I quickly realized that we were going to end up having a ton of specifications and sometimes they would only apply to very special cases. Other times they would be very broad cases and they needed to be even more composable than even the fluid interface implemented in Jeff’s implementation wasn’t going to be enough. It after all still required me to create a concrete implementation for each specification, no matter how minuscule it might be.