Opinion mining is crucial for both individuals and companies. Individuals may want to see the opinion of other customers about a product to analyze it before buying it. Companies want to analyze the feedback of customers about their products to make future decisions. So, analyzing customer"s opinion and their response is important. Mining is used on product reviews that are available on different blogs, web forums, and product review sites to evaluate opinions of customers. By doing so, new customers are able to find views of others about a product and can decide which product to buy by the help of opinion of customers already using the product. In addition comparison of same feature of products by different vendors is done. In this way companies can focus on improving the features of their product that are not popular among customers. This leads to overcome the requirements of marketing intelligence and product benchmarking in the production industry. In this paper we do a survey of papers and will summarize the issues and challenges of opinion mining that affect the results of opinion mining.

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Abstract-EnergyManagers and Government Office Holders in Pakistan are nowadays pondering over multiple options for the resolution of ongoing Energy crises in the country.LNG (Liquefied Natural Gas) import has been finalized for being the quickest remedy among all the available options. LNG (Liquefied Natural Gas) contract is at the verge to be implemented in Pakistan. However there are several factors that need to be addressed while implementing the project. In this paper, identification of the challenges affecting the optimized distribution of gas is presented. The sustainability of LNG (Liquefied Natural Gas) Project depends upon the successful running of the project without facing any financial crises arising from the gas distribution losses. The motive of this paper is the identification of the factors that are risk for the sustainability and successful running of LNG Import in Pakistan on long term basis. In association it is required to identify technical and managerial challenges for the gas distribution companies in distribution of LNG. Moreover recommendations are proposed for modification in existing infrastructure and governing policies related to gas distribution companies for logical success and long term sustainability of LNG import in Pakistan.