The standard practice is to divide product testing into different levels like Unit, Integration, System and UAT. There is always a claim in all the organization that they have planned some of these tests and executed. What is surprising is everything in software terminology is evolving with time but these definition for levels of testing remains same even now! But what you can observe is the confusion on definition of an "unit" within the team. Can we look at differently the definition of level of testing which is acceptable to all with no confusion? How about coming up with defect types and define the quality levels where these defects types must be uncovered. HBT recommends 9 levels. This goal-centric approach to testing will also help us to organize test assets better and helps to demonstrate the adequacy of test assets. Overtime it will also help us to prioritize tests for execution in each cycle of testing, select right type of test for automation and determine the right competency required for execution of certain types of tests. All these focus finally leads to effective and cost-efficient validation strategy acceptable to any stakeholders.
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