REJOINDER: Constructs and Measurement Principles in the Second Century of Ability Testing

“The Second Century of Ability Testing: Some Predictions and Speculations” did not include predictions about the ability construct or the role of fundamental measurement principles. All commentators raised issues about the nature of the ability construct (Barrett, Bunderson, Fisher, Golden & Goldman, Mislevy, Sternberg,). The diverse viewpoints represented in these comments highlight well the complexity of the construct issues. Measurement principles were also mentioned by several authors (Barrett, Fisher, Golden & Goldman, Mislevy). Some of these commentaries have directly opposing concerns about the role of measurement models in ability testing. Although the commentaries had several other valuable points, the construct and measurement issues need summarization and integration. Later, I summarize and elaborate the issues in these areas and speculate on their place in the second century of ability testing.