This book is comprised of one study andthree field evaluations of civic tech initiatives indeveloping countries. The study reviews evidence on the useof twenty-three information and communication technology(ICT) platforms designed to amplify citizen voices toimprove service delivery. Focusing on empirical studies ofinitiatives in the global south, the authors highlight bothcitizen uptake (yelp) and the degree to which public serviceproviders respond to expressions of citizen voice (teeth).The first evaluation looks at U-report in Uganda, a mobileplatform that runs weekly large-scale polls with youngUgandans on a number of issues, ranging from safety toaccess to education to inflation to early marriage. Thefollowing evaluation takes a closer look at MajiVoice, aninitiative that allows Kenyan citizens to report, throughmultiple channels, complaints with regard to water services.The third evaluation examines the case of Rio Grande doSul’s participatory budgeting - the world’s largestparticipatory budgeting system - which allows citizens toparticipate either online or offline in defining the state’syearly spending priorities. While the comparative study hasa clear focus on the dimension of government responsiveness,the evaluations examine civic technology initiatives usingfive distinct dimensions, or lenses. The choice of theselenses is the result of an effort bringing togetherresearchers and practitioners to develop an evaluationframework suitable to civic technology initiatives.