Abbreviations can be used frequently

Abbreviations should be used when they are likely to be understood by the audience.

Background

Furia (Ten myths about technical writing) talks about spelling out abbreviations on first use and then using them as needed and how they should be used as appropriate to the audience and subject matter.

Survival tips

Follow the style guide.

Commentary

This seems like a matter of style and audience expectations. If readers expect an abbreviation, spelling it out will seem awkward. Likewise converting frequent phrases to abbreviations can make the text much less readable.

Mentions

• Ten myths about technical writing

References

Your favorite style guide