Second Language Research Methods - Oxford Applied Linguistics:

Based on a set of four research parameters, this book discusses the development of research questions and hypotheses, naturalistic and experimental research, data collection, and validation of research instruments. Each chapter includes examples and activities.
Are you about to start a Master's degree where you will be carrying out research for the first time? Or do you refer to research in your work as a teacher, teacher trainer, or materials writer? However you are involved with research, this book will give you a clear and thorough introduction to all the main types of language learning research.
Familiarizes you with the basic types of research design used in second language studies
Gives you a genuine feel' for what doing research is like, by giving you specific roles (e.g. research subject, data collector, data analyst, reporter) within a variety of mini-studies
Explains different research types in detail: why they are used; how they are designed; what the different stages are for carrying them out; and how to evaluate them.
Introduces you to some of the classic research studies into second language learning and encourages you to analyse and discuss them.