Abstract-Due to innumerous advantages the Global software engineering is trending now a days in software development industry. Basic drivers for this trend are flexibility, faster development and expected cost saving. Software development has moved from traditional development to the global software development (GSD). Global software development is very important and ordinary practice in the software industry. In GSD, the developers are distributed across different sites and different countries, and lots of problems arise due to the physical social and cultural barriers. Global Software development is facing a number of challenges including Geographical distance, Communication and collaboration, time, culture, trust, tasks distribution, requirements gathering and collaboration. In this paper, authors conducted a detailed study on geographical distances and communication challenges in GSD, their inter dependencies, and also the proposed solutions and guidelines to address these challenges that are very critical in the success of GSD projects. Also in this paper a detailed literature review is provided, combined results are summarized and on the basis of these studies, a comparative study is made. This research will be helpful for other researchers to draw new strategies to tackle these challenges.

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As we are living in the Era of Computer Science and almost all individuals and the organizations are completely relying on software systems. The requirement engineering is the most vital and important aspect in the success of any software engineering project. Requirement Engineering is a set of different process that works at different levels, which are incorporated at individual and organizational level Projects We need to consult different sources to find requirements. We need to involve personals from the different fields to find a set of quality requirements. The security issues undergoes as soon as early in the 1st phase of requirements. It is shown from the studies that if we consider Quality Process of Requirement Engineering at the phase it results in saving of million dollars. This paper contains the details study and comparison of different RE Process Models and Requirement Elicitation techniques. This paper elaborates the vital aspects of different Requirement Engineering Process models that help in the selection of appropriate model for the Requirement Engineers and practitioners working in the industry. This Paper also Focus on the giving a detailed view of Elicitation techniques and comparative study including the characteristics and their strengths and weakness. Some strengths and weakness found during detailed study are also structured and listed that is also the helpful for the Appropriate selection of RE Process model.