Klosterneuburg, Austria

Software Systems Theory

Language: English Studies in English
Subject area: computer science
University website: www.ist.ac.at
Software
Computer software, or simply software, is a part of a computer system that consists of data or computer instructions, in contrast to the physical hardware from which the system is built. In computer science and software engineering, computer software is all information processed by computer systems, programs and data. Computer software includes computer programs, libraries and related non-executable data, such as online documentation or digital media. Computer hardware and software require each other and neither can be realistically used on its own.
Theory
A theory is a contemplative and rational type of abstract or generalizing thinking, or the results of such thinking. Depending on the context, the results might, for example, include generalized explanations of how nature works. The word has its roots in ancient Greek, but in modern use it has taken on several related meanings.
Theory
If you refuse to take account of theory, then you have forgotten that practice is often an offspring of theory.
Fausto Cercignani in: Brian Morris, Simply Transcribed. Quotations from Writings by Fausto Cercignani, 2014, quote 54.
Theory
Never call yourself a philosopher, nor talk a great deal among the unlearned about theorems, but act conformably to them.
Epictetus, Enchiridion, 46
Software
How can it be that we have so much software that is reliable enough for us to use it? The answer is simple; programming is a trial and error craft. People write programs without any expectation that they will be right the first time. They spend at least as much time testing them and correcting errors as they spent writing the initial program. Large concerns have separate groups of testers to do quality assurance. Programmers cannot be trusted to test their own programs adequately. Software is released for use, not when it is known to be correct, but when the rate of discovering new errors slows down to one that management considers acceptable. Users learn to expect errors and are often told how to avoid the bugs until the program is improved.
Parnas, David L. (Jan 1 1985). "The Parnas Papers". SIGCAS Comput. Soc. 14,15: 27-37. DOI:10.1145/379486.379513.
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