Uwe Flick 
Managing Quality in Qualitative Research [PDF ebook] 

Quality underpins the success (or failure) of any piece of qualitative research. In this book, Uwe Flick takes you through the steps in method and design to ensure quality and reliability throughout the entire research process. Showing hands-on what it means to 'manage’ quality, this book puts the spotlight on practical questions and steps researchers can use to continually interrogate, improve and demonstrate quality in your research.