Gather and review together, write alone. It’s very unlikely that you personally have all the relevant context to write the best design document on a given topic. Before getting far into the process, collect input from folks with relevant perspectives, particularly those who will rely on the output of your design document. However, be skeptical of carrying that collaborative process into writing the design document itself. Most folks are better writers than they are editors. This means it’s usually harder to edit a group document into clear writing than to identify one author to write a clear
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