Sharing your viewpoint will serve only to improve future work. Interpreters charge by the hour or sometimes by the day and will often have a minimum charge to account for the possibility of a short or cancelled appointment. Rates are usually higher for the more specialized conference and simultaneous interpreting. Reimbursement of travel, parking and other expenses is often negotiable and should be confirmed in writing. Text length and complexity are the determining factors for translation charges.
Translators usually charge by the word, line, page or total text.
Services such as extensive formatting, desktop publishing or editing may incur additional charges. For an accurate comparison, request a total dollar estimate, since many languages expand considerably in translation. Once you have decided whose services you will engage, you should be prepared to sign some type of a contract. Whether it be a formally prepared contract, a company purchase order or a letter of commitment, it should set out the terms of your agreement including such things as services agreed upon, delivery date, delivery mode and price. Clear communication should pave the way to a positive professional relationship.