This accessible book outlines the key ingredients of psychological assessment and provides case studies to illustrate their application, making this an ideal textbook for courses on psychometrics or psychological assessment. The book covers the nature of assessment, basic components, how tests are made, underlying statistics, reliability and validity, assessment of intelligence, abilities and personality, non-psychometric approaches, as well as ethical and professional issues and modern developments. A final chapter explains how readers can construct their own tests. Wide-ranging case studies demonstrate the variety of contexts in which assessment is conducted. The author’s clarity of writing and use of practical examples throughout helps students apply these methods in practice with confidence as part of their studies on an array of courses.

The Basic Components – Scales and Items

The basic components – Scales and items

Learning Objectives

By the end of this chapter you should be able to:

  • Give an account of the different types of scale and items available for psychological assessment and discuss their advantages and limitations.
  • Explain and critically evaluate the principal approaches to item analysis using Classical Item Analysis, Item Response Theory and Rasch modelling.
  • Understand scientific thinking about the nature of attitudes and their key characteristics.
  • Identify the different approaches to scaling and measurement of attitudes.

What is This Chapter about?

This chapter deals with the basic underlying components of assessment – scales and items. Getting them right is crucial. Scales enable us to transform the responses of people into scores which provide a quantitative means of measuring characteristics ...

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