ABSTRACT
Investigations of behavioral change and development rely heavily upon the quantification or measurement of both those variables in which developmental changes occur (consequent or dependent variables) and those variables that may be responsible for the changes (antecedent or independent variables). In fact, it is in the assessment of changes in behavior that some of the most troublesome and difficult issues related to measurement in the behavioral sciences have been identified, as discussed in Chapter Twelve. To facilitate the presentation of certain issues related to the measurement of change, some elementary measurement concepts will be presented for consideration and review in this chapter.
