A series of experiments on operant variability by Neuringer and colleagues (e.g., Neuringer, 1986, 2002; Page & Neuringer, 1985) have been repeatedly cited as showing that behavioral variability can be reinforced by making reinforcement contingent on it. They showed that the degree of variability in pigeons' eight-peck sequences, as measured by U…

In the US debate over science-based educational research, experimentation is again coming to the fore as ideal for establishing an evidence base of what works in educational interventions thus contributing to the climate of accountability in educational research and practice. Mixed methods research is being positioned in this discussion as a…

This article uses a parable to compare qualitative (interpretive) and quantitative (experimental) methods in child language research. Two hypothetical young researchers both investigate question-asking behavior of children with autism. Five different possible endings to the parable illustrate various relationships among research approaches and…