There are a few key questions that can only be answered through rigorous testing.
Software is a nebulous thing; how do you know what your company has purchased without a rigid testing practice?
Business process requirements are notoriously complicated and can often have cascading dependencies. How do you know that a software developer (typically a person who has never held the job for which they are creating software to assist) is interpreting your set of requirements in the same manner that you are? Furthermore, how do you know that your colleagues also share your interpretation of the business process?
How can effective documentation be created? Documentation that you can hand over to a person learning the system written so impeccably well that you won't have to spend time answering "simple" follow-up questions?
How do you know which portions of your business process work well on your chosen software platform and which portions do not?
After your software project goes live, how can you be sure that new features added to the system aren't breaking old features?
There are a lot of reasons to test early and often. So invest the time for testing early and keep the time allocated throughout the lifecycle of your project. If you don't, you'll burn more time than you would have for testing on explaining and cleaning up defects.
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