Context. The requirements analysis phase, as the very beginning of software development process, has been identified as a quite important phase in the software development lifecycle. Software Requirement Specification (SRS) is the output of requirements analysis phase, whose quality factors play an important role in the evaluation work. Readability is a quite important SRS quality factor, but there are few available automated approaches for readability measurement, because of the tight dependency on readers' perceptions. Low readability of SRS documents has a serious impact on the whole process of software development. Therefore, it's extremely urgent to propose effective automated approaches for SRS documents readability measurement. Using traditional readability indexes to analyze readability of SRS documents automatically is a potentially feasible approach. However, the effectiveness of this approach is not systematically evaluated before. Objectives. In this study, firstly, we aim to understand the readability of texts and investigate approaches to score texts readability manually. Then investigate existing automated readability approaches for texts with their working theories. Next, evaluate the effectiveness of measuring the readability of SRS documents by using these automated readability approaches. Finally, rank these automated approaches by their effectiveness. Methods. In order to find out the way how human score the readability of texts manually and investigate existing automated readability approaches for texts, systematic literature review is chosen as the research methodology. Experiment is chosen to explore the effectiveness of automated readability approaches. Results. We find 67 articles after performing systematic literature review. According to systematic literature review, human judging the readability of texts through reading is the most common way of scoring texts readability manually. Additionally, we find four available automated readability assessments tools and seven available automated readability assessments formulas. After executing the experiment, we find the actual value of effectiveness of all selected approaches are not high and Coh-Metrix presents the highest actual value of effectiveness of automated readability approach among the selected approaches. Conclusions. Coh-Metrix is the most effective automated readability approach, but the feasibility in directly applying Coh-Metrix in SRS documents readability assessments cannot be permitted. Since the actual value of evaluated effectiveness is not high enough. In addition, all selected approaches are based on metrics of readability measures, but no semantic factors are blended in readability assessments. Hence studying more on human perception quantifying and adding semantic analysis in SRS documents readability assessment could be two research directions in future.

This diploma thesis defines the issue of software requirements engineering and the implementation of software requirement into IS/ICT projects. One of the aims is to highlight the importance of systematic requirements management to successful IS/ICT projects. The theoretical part of thesis includes requirements definition, requirements typology and qualitative parameters of good requirement and actors, that are involved into the process of requirements management. The practical part of this thesis defines the process of requirements management general accepted methodologies of as it is specified in the internationally recognizable methodologies. Author's own contribution is the definition of a methodological process for managing requirements specifications, based on rigorous methodologies and extended to reflect author's practical experience. Methodological approach is tailored to the needs of smaller software companies and small to medium scale IS / ICT projects, and, if necessary, is further extendable. Another practical benefit of this thesis is the recommended methodology for change management requirements. Proposal process is based on the ITIL set of best practices; sub-threads are adapted to be able to meet the change management requirements and the broader business environment infrastructure. This methodology emphasizes an individual approach to the requirement. There is a recommendation of appropriate software tools for development and management requirements support divided into partial ITIL processes.