Internationalization is the design and development of a product, application, or document content that enables localization for target audiences that vary in region or language.

Software users may select (via regional settings) the country of their choosing and the application selects the proper units of measure, currencies, date formats, and number formats. For example, in Windows, the user is able to set the operating system's Regional settings (formatting and location) to the country that they are in or prefer. Therefore, the EPRI software needs to be able to handle the changes.

The software manual should provide an explanation for International Units options.

Where numbers are used with scientific units, the ability to use both US English and Metric (or International System of Units (SI)) units is required by EPRI.