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Vehicular Ad hoc Network could manage the various critical issues of road transport. That is why it is the most crucial field of research for most of the researchers. This survey paper discusses various issues related to Security Challenges, Security Architecture actors, Security Authentication, Application Constraints, various trust models etc. this paper encourages you to think about various fields of work need to be carried out in this field for the better VANET environment. Various schemes have been mentioned which could be improved further as per considering various real time conditions.

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Agile methodologies has given a break from traditional software development models and has proved to be powerful in accommodating requirement changes and induce degree of flexibility in the software development life cycle. These characteristics have made agile an obvious choice among all software development models. One of the main objectives of any model is to cater to risk, identify, analyze, assess and plan. On the contrary agile does not clearly states anything in regard to risk management. This paper targets in analyzing agile methodologies and risk management model, amount of risk handling capabilities in agile and requirement of merging risk management in agile.

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