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This article discusses the history of randomized controlled trials (RCTs) in development economics and the ways in which their use has shaped disciplinary practices and development policy over the past two decades. We first explain how increased use of academic-run RCTs internationally has led to important methodological breakthroughs that have advanced our knowledge of human behavior as well as changes in how research is conducted, including routine practice of in-field apprenticeships for young researchers and the establishment of robust research infrastructure in numerous developing countries around the world. We then explore three ways in which the scale-up of evidence-informed programs and policies based on findings from RCTs have achieved real-world impact, giving examples for each. These include how rigorous evidence can help to resolve contentious policy debates; enable policy-makers to assess external validity of findings and draw lessons across contexts; and support institutionalization of evidence use in various types of organizations.

The Online Travel Booking Services is the modern way of attracting people for the tourism industry. The tourism has become so easy because of this service and there are lots of improvements needed for this industry as whole. There are OTBS functions even for middle class people or salaried person who cannot afford costlier services. So there are few online tourist websites which provide quality service at a cheaper cost which is a great advantage for middle class people. This would increase the revenue of the tourism industry which is in turn an advantage for the government. The more detailed and beautiful websites attracts more tourists as they have a glimpse of what is available in the place and all the details about their travel. So our government should take keen action on developing more services regarding to OTBS which is the future of tourism industry.