# Behavioral Measurement as Centerpiece

## TL;DR

This paper reviews Hank Pennypacker's contributions to behavioral measurement and its evolution in applied behavior analysis.

## Contribution

The paper highlights the evolution of behavioral measurement practices through Pennypacker's influential works.

## Key findings

- Pennypacker's work became central to behavioral measurement in applied behavior analysis.
- The paper discusses how applied research challenges shaped the evolution of measurement practices.
- Key contributions are traced through several editions of Pennypacker's influential books.

## Abstract

Hank Pennypacker’s interest in behavioral measurement began early in his career and gradually became the centerpiece of his diverse accomplishments. A review of his focus in the 1960s is followed by a brief summary of the evolution of behavioral measurement practices in applied behavior analysis as it emerged from the field’s laboratory history. This examination serves as pretext for a discussion of the contributions of Strategies and Tactics of Human Behavioral Research (Johnston & Pennypacker, 1980), Strategies and Tactics of Behavioral Research (Johnston & Pennypacker, 1993a, 2009), and Strategies and Tactics of Behavioral Research and Practice (Johnston et al., 2020) to emerging matters of behavioral measurement. That discussion focuses on how issues raised by the challenges of applied research and practice have evolved.