The book is structured into three comprehensive parts across 23 chapters, designed to guide a researcher from initial concept to final report. Academia.edu Part One: Principles of Test Construction Covers the history and levels of psychological measurement. Detailed steps for test construction , including item writing, item analysis, and establishing reliability Part Two: Principles of Measurement Focuses on measuring specific traits like intelligence, aptitude, achievement, and personality Includes specialized techniques such as projective techniques and various methods of observation. Part Three: Principles of Research Methodology Detailed exploration of sampling methods (probability vs. non-probability). Coverage of diverse research designs, including historical research single-subject experimental research , which is highlighted for its rigor in behavioral studies. Guidance on formulating hypotheses

Distinguishes between probability and non-probability methods.

It places a strong emphasis on Single-Subject Research Design , making it highly relevant for clinical and educational studies.