Quality will always be a concern in all stages of planning and execution. Software quality is defined as the functionality of a product that satisfies the user or customer requirements. To achieve quality, check characteristics that define the quality of a product. For each characteristic of quality, set standards. Find out the reason that is affecting the software quality and rectify it.


INCREASING CRITICALITY OF SOFTWARE: The end-user of the software product will always have a concern about the quality of the software product. For example, in aircraft systems, the customers are concern about the quality of the product. Any software failure in this may lead to dangerous accidents.

ACCUMULATING ERRORS DURING SOFTWARE DEVELOPMENT: A software product undergoes several stages to get it finished as a deliverable product. If the error in the initial stage is not identified, then it may get increased in the further stages causing disasters like the failure of the product. If the error is found at the later stages, then it will be more expensive to solve these errors. The debugging phases will be difficult since the numbers of errors are unknown.

REPUTATION: Some companies have a strong reputation among people because of their quality of production. A good, solid reputation is hard to earn but easy to lose. So the company with a good reputation will have a strong business. The loss of quality in their product will not only bury their reputation but also affects sales and marketing.


Software quality is groped into three sets namely product operation qualities, product revision qualities, and project revision techniques.


  • CORRECTNESS: It is the agreement of program code with specifications. The product should be independent of the actual application of the software system. It is the extent to which the software satisfies the user requirements and specifications.
  • RELIABILITY: Reliability of software is defined as the level of the system that fulfills the qualities under specific input trials in a specific period. The software will be seen as reliable if it has a low number of errors. The sub characteristics of reliability are maturity, fault tolerance, and recoverability.
  • EFFICIENCY: The ability of a product can perform its function with the best possible utilization of time and space. A product that works with high speed and low space and memory will be more efficient.
  • INTEGRITY: Software integrity is the process of maintaining the safety and security of the code. Analytics will be clear and accessible. It prevents the product from cyber threats.
  • USABILITY: It is the user’s experience of using the product. The product should attain the user’s satisfaction. The sub characteristics of usability are understandability, learnability, and operability.


  • MAINTAINABILITY: It is the suitability for debugging and modification of an application. Readability, extensibility, and testability are the qualities that maintainability relies on.
  • FLEXIBILITY: The ability of the software to be flexible to external environmental and user’s requirements.
  • TESTABILITY: The ability of software to undergo debugging. The software should have to meet the user’s conditions and produce the best product.


  • PORTABILITY: The ability of software to work in other environments than the place where it was originally designed. The portability of the software depends on the hardware independence, the language of implementation, and hardware properties.
  • REUSABILITY: It is the ability of software to be reused in different environments. It is achieved by software metric techniques.
  • INTEROPERABILITY: It is defined as the ability of different software that facilitates the effective exchange and process of information with one another. Interoperability testing methodology follows the PCDA (Plan, Do, Check, Act) Cycle.