This introduction presents an overview of the key concepts discussed in the subsequent chapters of this book. The book focuses on the nature and causes of three different crises. There are namely as an economic crisis, an ecological crisis and a normative crisis. Tony Lawson argues that the widespread and long-lived failings of academic economics are due to an over-reliance on largely inappropriate mathematical methods of analysis. David Tyfield uses an aspect of the economy itself specifically the knowledge-based economy as a case for raising a more general critique of mainstream economics. Petter Nss uses the meta-theoretical perspective of critical realism to critically discuss the use of cost benefit analyses of transportation infrastructure investment. Jin Xue critically scrutinizes economic, social, environmental, and ethical arguments for and against economic growth as a strategy to deal with the contemporary socio-economic and ecological crises. Leigh Price revisits the idea of wicked problems first introduced in 1973 by Horst Rittel and Melvin Webber.