Mixed method research involves using both quantitative and qualitative methods in a single study. There are four basic designs: convergent parallel design, explanatory sequential design, exploratory sequential design, and embedded design. The convergent design collects both types of data simultaneously and merges the results, while the sequential designs implement the methods in phases to build on each other. The embedded design incorporates one method within a study using the other method predominantly. Key decisions in choosing a design are the level of interaction between methods, priority, timing, and mixing strategies.