This work summarizes an ongoing longitudinal study concerned with the nature of human differences as manifest in peoples' life histories. The traditional models for the description of human differences are reviewed, then contrasted with the presentation of alternative models. This volume is also one of the few to investigate different approaches to measurement procedures. Practical applications of these models and the results obtained in a 23 research effort are discussed.

This work summarizes an ongoing longitudinal study concerned with the nature of human differences as manifest in peoples' life histories. The traditional models for the description of human differences are reviewed, then contrasted with the presentation of alternative models. This volume is also one of the few to investigate different approaches to measurement procedures. Practical applications of these models and the results obtained in a 23 research effort are discussed.