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The book builds on the author's experience in evaluating health communication projects in the US and developing countries and in teaching evaluation to graduate-level students in public health. It will be of use to both students and researchers and designers involved in all types of evaluation activities. The chapters are divided into three sections. Part I covers health promotion framework and theories, formative research, and process evaluation methods. Part II deals with study designs, the techniques to determine sample selection and size, writing questionnaires, constructing scales, and managing data. Part III uses data from a national campaign to illustrate methods for impact evaluation including basic and advanced statistical analysis. This text provides the tools needed to understand how and why evaluations are conducted, and it will serve as a reference for evaluators. 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Network interventions (NIs) are purposeful and planned efforts to use social networks or social network data to generate social influence, accelerate behavior change, improve performance or quality, and\/or achieve desirable outcomes among individuals, communities, organizations, or populations.\u003c\/p\u003e\u003cp\u003eThis book is designed to be a guide or primer on how to use the powerful and formal set of mathematical and computational tools developed in the network analysis field to engage individuals, communities, organizations, and\/or populations to bring about change. This change can be the spread of information, culture changes, attitude shifts, or accelerating adoption of new behaviors. It is designed to inform medical and public health professionals who are often tasked with promoting behaviors that improve health or prevent disease at the individual, organizational, community, regional, and\/or national levels. 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