Contract change types are as follows:
1. Administrative Changes: no changes affecting the project work, such as changing the mailing address or telephone number.
2. Change Notice: follow the change management process, a written order signed by the person signing the contract, the seller in order to be able to make a change.
3. Incomplete Contracts behavior: before the completion of the final contract has not yet started work, because the contracts take longer and work according to a letter of intent to start.
4. Supplementary Agreement: the buyer and seller agree on changes to the contract.
5. constructive changes:
1) the buyer does not indicate the correct result in unacceptable product or service;
2) impossible to achieve specifications;
3) incorrect understanding of the contract;
4) Check excessive;
5) the buyer the seller failed to disclose changes in the work of knowledge;
6) to improve performance;
7 property) owners or customers of delays or inappropriate;
8) improper use of the ownership of capital