Integrated Work flow Model and Technical Acceptance Testing
Integrated Work flow Model:
IST: Integrated system testing otherwise known as System Integration Testing is one such testing phase in which all the internal interfaces of the system is tested from both functional and operational perspective.
In IST we would concentrate more on the functionality of the system along with the integrity when it communicates with its interfaces. Functional testing techniques such as Boundary Value Analysis (BVA), Equivalence Partitioning and use case based testing, State transition table and decision table analysis. Since the system tends to fail more on the boundaries we give more emphasis on BVA and Equivalence class.
TAT – Technical acceptance testing
TAT is a testing phase in which the system is tested if it is acceptable as per the technical specifications. Once SIT is complete the system is passed for UAT or TAT. UAT/TAT is the final phases before the Production. In UAT phase, the business users typically the end users test the application from end to end business perspective.
If the system undergoes a change from the functional perspective then the system needs to be UAT’ed before the new build goes into production. But at the same time, when there are changes to the system from the technical perspective like change in the load balance of the servers, then the system needs to under go load and stress testing. These phases of testing come under TAT.
Once UAT or TAT is complete then the system would go into preproduction where the system is checked for back-out and finally it is released into production.
In other words TAT can be defined as a phase that verifies and validates the technical compliance of software regarding to the production’s standard.
Arun Vijayaraghavan is a Senior QA working for one of the world's largest Investment Banks. Arun has extensive experience in Retail Banking, Investment banking and non-life insurance domains.
