We really must get organized…
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Create static groups, smart groups, virtual groups, and organize them in folders. Get instant visual feedback showing which groups a reference belongs to. Apply color labels and your own star ratings. Mark references based on arbitrary criteria. Easily move references between groups. Use global operations to add keywords, search/replace, move fields, and more.

groups

Term Lists in the List View (as below) or in a separate window keep track of every author, editor, keyword, journal, or items from almost any other field. Select one or more terms to instantly retrieve all the corresponding references. Add terms to one or more references with a simple drag and drop or contextual menu. “Pin” terms and use the text filter to drill down through your terms to find just what you need.

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The number of degrees of freedom is, well, liberating.