Testing Methodology

Field and Cognitive Testing

The purpose of testing is to:

  • Determine if questions are being interpreted as intended.  That is, are they capturing important aspects of selected functional domains
  • Determine if questions are interpreted consistently across countries
  • Gain further insight into alternative prevalence measures

There are two main types of testing:

  • Cognitive – A direct look at how people are interpreting the questions. Normally cognitive testing is done first to refine questions.
  • Field – How do the questions work operationally?  What is the relationship between the answers to different questions? Field tests are done to refine operations.

The objectives for testing the WG questions are to:

  • Determine whether a single question per domain is representative of that domain
  • Determine whether the questions produce comparable data across countries
  • Determine how the WG questions work as a set in comparison with other questions used by the country
  • Determine if the questions are interpreted consistently in different languages


Guides for field testing and cognitive testing


Other publications

A more detailed description of testing can be found in the forthcoming book – B. Altman (Ed), International Measurement of Disability: Purpose, Method and Application. Springer: Social Indicators Research Series 61.

The table of contents are available to view:

 List of countries who have undertaken cognitive and/or field testing of the WG question sets

  • Argentina
  • Belize
  • Brazil
  • Cambodia
  • Cameroon
  • Congo
  • Egypt
  • El Salvador
  • Fiji
  • Gambia
  • Indonesia
  • India
  • Italy
  • Kenya
  • Lesotho
  • Maldives
  • Mauritius
  • Mexico
  • Mongolia
  • Myanmar
  • Oman
  • Paraguay
  • Philippines
  • Samoa
  • Serbia and Montenegro
  • South Africa
  • Sri Lanka
  • Tanzania
  • Uganda
  • United States of America
  • Vietnam
  • Zambia

Some of these results are available on the Use of WG questions page.

This page was updated on: Wednesday, April 27, 2016