Why greater focus on Testing and Quality Assurance is needed in organizations?

Testing software systems to make sure they perform as expected and to ensure their reliability is a very critical quality control activity. Unfortunately this critical activity is being performed on almost every software project in a very ad hoc, informal manner by developers, testers, and users. The testing phase in many software projects mostly goes without planning and test teams often do not have the bandwidth to perform adequate testing. Hence a large number of defects do not get identified and they create greater customer dissatisfaction. Hence a greater focus on testing and quality assurance is needed.