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The acronyms are often applied in early-to-mid-stage engineering project documentation and preliminary contracts in industry. Although used for all kinds of interim/preliminary or unknown-at-the-time-of-writing data, the most common uses in engineering documents and contracts are related to:

• dates of commencement, completion, etc; estimated total or remaining time to do a specific work task
• money amounts, i.e. costs, prices
• physical or derived quantities as-yet-to-be-obtained from tests/measurements
• engineering values depending on one or more of the above, with safety margins included

See also: ASAP, RSN (informal)