The Gang of Four design patterns have been elegantly distilled into a quick reference guide suitable for printing on 8.5 x 11.

You can get a larger version for your office wall, too. Check out the poster size. It’s perfect for any software organization.

I’ve posted low-resolution versions of the two cards here with the author’s permission. Links to the high-res printable versions are below on the author’s website.

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Jason McDonald created these high-quality reference cards. Click here to view the printable high-resolution images.