ABSTRACT

In this chapter we consider designs that extend beyond the simple comparison of two conditions. Beyond pen and laptop, you could compare both with a third option, perhaps having full printed notes of the lecture. Considering critical thinking, you could assess not just pretest and posttest scores, but also scores a month and a year later-it’s a vital issue how long any gains endure. Such studies add one or more further conditions and, therefore, are taking a step beyond the two basic designs we discussed in Chapters 7 and 8. They have extended designs, but with still just one IV (independent variable). In Chapter 15 we’ll take a further step beyond, and consider extended designs that have more than one IV.