Instruct: Classify Amazon reviews into positive or negative sentiment
Query: perfect tool for students and teachers

the KKV (king, Keohane and Verba) is one the best tool for beginners in research for social, political, International Relations students or academics. it delivers advices and problems that researchers will come across at one moment of the research life. it also offers a good overview and critical analysis of what research is.the authors make sure the heavy subject that is reasearch in social sciences is not too heavy to read. the books approaches the different methodologies that research will have to chose.if not owned yet, it is in need to be buy and must belong the student private library.