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EN
It discusses the two formal models of software testing by the concept of a black box. In the first model assumes a non-zero probability of not removing the detected error. In the second model assumes also non-zero probability to introduce additional of error, so-called secondary error. In both cases the systems of Chapman-Kolmogorov differential equations was formulated. Solving them was obtained formulas to enable an estimate the expected number of errors remaining in the software after end of testing and estimation of the expected duration of the process to complete software testing them.
EN
The article seeks to arrive at a proper understanding of the most challenging words in the field of software testing, i.e., mistake, error, bug, defect, fault, and failure. The paper presents a semantic analysis of the words, for non-English practitioners of IT find it difficult to discriminate between them. The article is based on native English texts such as dictionaries, blog posts, software testing manuals and the like in order to ensure linguistic reliability and better understanding of the terms. The meaning of selected terms is compared by means of standard dictionaries and those dedicated to IT practitioners. Moreover, a theoretical overview of terminological issues in IT is conducted.
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