theory-a well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena; theories can incorporate facts and laws and tested hypotheses; true in fact and theory.
wikiHow to Write Vendor Contracts. Some companies and organizations partner with vendors to provide a better product or service. Other businesses use vendors as contractors, providing something they need either on a one-time basis or an ongoing schedule. For example, many companies use vendors to supply technology, cleaning services, office equipment, or transportation. Anytime you use a vendor, you and the vendor should both sign a contract.
The contract should also record the terms of payment; typically, vendors ask for a 50 percent deposit upon signing, with the balance due shortly before or on the day of the wedding. Signing and Making Changes. Once you have agreed on a contract, both you and the vendor need to sign it.he contract must also list the vendor's fee and a breakdown of the costs. Some contracts have a price-escalation clause, which allows for unforeseen expenses. If you can't get the clause deleted, insert a ceiling on the total costs; no more than 15 percent over the base price is fair.