Part of any good advice on writing is to cut everything that isn’t doing some work. As the classic says ‘Omit needless words’, ‘Vigourous writing is concise’.

It occurs to me that sometimes, especially with scientific writing, that rather than have a choice of what to include and what to omit, you have a fixed number of ideas to include and your task, as a writer, is the mirror of the maxim above. Rather than ‘omit needless words’ you must find a way to make needed the words/ideas you are compelled to include. Any advice on how to do this would be appreciated.