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- Always use capital letters to denote random variables - and (the same) lowercase letters to denote observed values. Example: "The time to failure T was observed to be t." (Note that both T and t are mathematical symbols and shall be written in a mathematical font - see previous item). Avoid using capital letters for parameters, such as test intervals, frequencies, and so on.
- Avoid abbreviations like e.g., i.e., and etc. in the text. Write instead: for example, that is, and and so on. The abbreviations may, however, be used inside parentheses, for example, (e.g., see Ref 1)
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