Review on text summarization evaluation methods

To familiarize oneself with a subject area summaries play an important role. Text Summarization is a challenging problem these days. Summarization is very interesting and useful task that gives support to many other tasks as well as it takes advantage of techniques developed for related Natural Language Processing tasks. Evaluating summaries and automatic text summarization systems are not a straightforward process. This review paper discusses an overview of text summarization, various evaluation approaches on intrinsic and extrinsic techniques. In principle, text summarization is achieved because of the naturally occurring redundancy in text and because important (salient) information is spread irregularly in textual documents. Recognizing the redundancy is a challenge that hasn't been fully resolved yet.