An editing function should have established reference items that provide standards that you can use and cite in your editorial work. Journalists use the Asociated Press guidelines. However, for "technical" editing, let's use what is commonly used in the technical publishing world:
When these resources don't provide guidelines or when they conflict, you have to make an editorial judgment call, which is based on the trends you see.
Beyond these resources is the "house," organizational, or corporate style guide. It states standards and guidelines that are not specified in the general resources, that are conflicting in the general resources or that vary from the general in accordance with the organization's preference
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