Acceptance testing is the last stage of validation. Client must either execute or take an active part in this.
Clients can perform any test, which is primarily due to their business actions. The main goal is to create a model office, in which systems are tested in an environment related to the field of application.
Contract acceptance testing shows the acceptance standard, which would have been determined in the contract.
Alpha testing and beta testing allow customers to use unfinished version of the product so if they bought the finished product and allow you to use their comments on it. Alpha testings are executed at the site of developers and beta testings - at the site of testers.
User Acceptance Testing
User Acceptance Testing is based on the adoption of new or changed systems. User Acceptance Testing is an essential stage of any Project and requires appreciable partaking of end users. For actual use, Acceptance Test Plan should be developed accurate and detailed, and with it the Acceptance will be reached. The last stage of the UAT can also include a parallel performance to confirm the difference between new and current system.
The User Acceptance Test Plan can be different in various systems, but testing should be performed so that to cover a realistic and adequate exposure of all the events that may occur. The testing has to comply with the User Requirements Specification, which requires the system.
Problems will always occur and it is important to figure out what to expect and meet the requirements of different parties concerned, such as Users/Customers; Project Software Command; Distributors and Consultants.