Software quality assurance
Software is a collection of instructions that tell a computer how to work. This is in contrast to hardware, from which the system is built and which actually performs the work. Software is the set of instructions that enables the hardware to perform a specific task. There are mainly three types of software in the market. Today we will discuss the entire life cycle of software development from requirements gathering to software testing.
1. System software
System software plays an important role in system software development. You think of software as being in layers, the system software is the bottom layer. It sits between the hardware and the application software.
Operating systems like Windows, macOS, Android, Linux, and iOS are examples of system software. Operating systems are loaded into RAM when the device starts up, and have access to the hard drive.
2. Utility software
It is part of the system software and performs specific tasks to keep the computer running. Utility software is always running in the background. Examples of utility software are security and optimization programs.
Security programs include anti-virus software that scans and removes viruses. Most computers will include some sort of anti-virus software, but you can add your own.
Optimization programs can include tools for system clean-up, disk defragmentation, and file compression. These tools are typically installed as part of the operating system. They have access to the hard drive to keep it tidy.
3. Application software
This is everything else! Anything that is not an operating system or a utility is an application or app. So a word processor, spreadsheet, web browser, and graphics software are all examples of application software, and they can do many specific tasks.
You can remove and add applications to your computer using the operating system.
Application software like a word processor regularly directs the operating system to load and save files from and to the hard drive. When you are working on a file, it is saved temporarily in the RAM. It is only when you choose to save it that it is written to the hard drive.
This is why, if the computer crashes while you’re working on a file, you may lose any changes you didn’t save. Data stored in the RAM is volatile. The data is lost when the RAM loses power.
Software testing plays an important role in the enhancement of quality. The professionals use the levels of software testing because they maintain the quality of a software system. The security of a software system also depends upon software testing. Because the professional developers, project managers, and testers ensure the security at a high level. There are four levels of a software testing process.
This is one of the core parts of the testing process because it ensures the quality in an earlier stage. The developer/ programmer is performing this level of testing. Here the professional developer tests the units of a component and its functionalities before submitting the component to formal testers. Programmers check out every unit of the functionalities of components in software system development.
Here the tester starts testing when the various functions and units are combining with each other in a component. Developers are connecting the modules and then execute them for testing purposes. This level of testing is call integration testing.
When all the components, modules & functionalities of a software system are completed then the testers perform the complete test. They will check all the components and the relationship among the components. Here the tester will test the entire system and ensure its quality and security. This level of the test is call system testing
Stakeholders including developers, project managers, designers, analysts, and architects will mutually perform the final test of the entire software system. They will ensure that the system is ready to publish or not because after releasing of the system it’s difficult to modify it.
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