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　　4.1 Introduction

　　This chapter will discuss all aspects relating to the design and execution of the main study. After briefly presenting the research questions, it will describe in detail the research questions, the research design, the participants, the instruments, the schedule of the study, and the methods for data collection and analysis.

　　The pilot study, which is described in the previous chapter, shared a number of characteristics with the main study, one of which was that they were both correlational and experimental in nature and they were mostly concerned with quantitative analysis. Van Lier (1988) defines quantitative research as involving measuring and controlling. Brown & Rodgers (2002) define experimental research as “studies that compare group behavior in probabilistic terms under controlled conditions using random assignment to groups” (p.12). Brown (1988) viewed correlational research as studies “designed to investigate the nature and strength of functional relationships among the variables of interest to the researcher” (p.126). 元认知策略研究：二语听力理解与附带词汇习得（英文版）