A method to integrate descriptive and experimental field studies at the level of data and empirical concepts.
Count behavior in real life, then treat every session as a tiny experiment—new tools make the 1968 plan doable on the fly.
01Research in Context
What this study did
Powell et al. (1968) wrote a how-to guide, not an experiment.
They told researchers to count behavior in real places—classrooms, homes, parks.
Those counts would create "empirical concepts" that link what we see with what we test.
What they found
The paper gave no new data.
It gave a road map: watch, count, label, then run mini-experiments on the same count.
The goal was one shared language for field notes and lab tests.
How this fits with other research
Iversen (2025) turns the idea into daily practice.
Each trial becomes a tiny replication; you graph responses minute-by-minute to see control happen.
Snodgrass et al. (2022) show six ways to plot rate and fidelity side-by-side, making the 1968 count visible and useful.
Manolov et al. (2022) give a free tool that marks when effects repeat across kids, giving the old concept a clear "yes, replicated" stamp.
Why it matters
You already take data in the natural spot.
Start treating each session as a string of mini-experiments: count, glance at the curve, and move to the next test.
The 1968 plan plus the new graphs and tools let you decide on the spot if your intervention is really working, no lab required.
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02At a glance
03Original abstract
It is the thesis of this paper that data from descriptive and experimental field studies can be interrelated at the level of data and empirical concepts if both sets are derived from frequency-of-occurrence measures. The methodology proposed for a descriptive field study is predicated on three assumptions: (1) The primary data of psychology are the observable interactions of a biological organism and environmental events, past and present. (2) Theoretical concepts and laws are derived from empirical concepts and laws, which in turn are derived from the raw data. (3) Descriptive field studies describe interactions between behavioral and environmental events; experimental field studies provide information on their functional relationships. The ingredients of a descriptive field investigation using frequency measures consist of: (1) specifying in objective terms the situation in which the study is conducted, (2) defining and recording behavioral and environmental events in observable terms, and (3) measuring observer reliability. Field descriptive studies following the procedures suggested here would reveal interesting new relationships in the usual ecological settings and would also provide provocative cues for experimental studies. On the other hand, field-experimental studies using frequency measures would probably yield findings that would suggest the need for describing new interactions in specific natural situations.
Journal of applied behavior analysis, 1968 · doi:10.1901/jaba.1968.1-175