If a special vocabulary is used or if the document is highly technical, more time will be needed to verify words used. Translation agencies generally offer management services that a freelance translator does not. However, freelance translators are often used by translation agencies. A freelance translator usually works alone and will translate and then proofread a document. A translation agency will usually have different people translate and proofread, thereby providing a double proofreading.
Agencies also offer management services for multi-language translation projects.
Translators do not usually provide multi-language management because translators are only fluent in specific languages. Agencies often have more technological capabilities and can offer desktop publishing, and screen capture services. Translators usually translate into their native languages only. No matter how experienced or educated a translator is in a foreign language, it is still a foreign language. People are generally more comfortable writing and reading in their native languages.