====== Testlets ======

===== What are testlets? =====

The term testlets was first officially introduced in late 1980s and defined as

  * "//a group of items related to a single content area that is developed as a unit and contains a fixed number of predetermined paths that an examinee may follow.//"(([[http://onlinelibrary.wiley.com/doi/10.1111/j.1745-3984.1987.tb00274.x/abstract|Wainer, Howard, and Gerard L Kiely. Item Clusters and Computerized Adaptive Testing: A Case for Testlets. Journal of Educational Measurement 24, no. 3: 185-201, September 1987.]]))

Simplified, testlets:(([[http://www.jstor.org/stable/1434763|Wainer, Howard, and Charles Lewis. Toward a Psychometrics for Testlets. Journal of Educational Measurement 27, no. 1: 1-14, Spring 1990.]]))


  * are **small tests** of single units from which together construct a test;
  * should be small enough to manipulate but big enough to **carry their own context**;
  * can be used to **balance contents** of a test.