Methods of validating a questionnaire
The above comments outline our experiences in adopting and adapting one international and two country-specific validated and published(6,7,8) questionnaires in Greece and Albania. Hands-on guide to questionnaire research: selecting, designing, and developing your questionnaire.
Various steps are required to assure the validity and reliability of the ICIQ.
As a side note, some words don’t work well in the original language to native speakers.
In our view, it is important for researchers to realise that adopting and adapting an existing instrument for developing a multilingual or foreign language questionnaire is not an easy task. Patients in Europe evaluate general practice care: an international comparison. Description and survey of the current situation (chapter 3). Making Primary Health Care effective in every day practice: a handbook for use by the health professionals of the Health Centres and Peripheral Surgeries (in Greek).
So if we say a questionnaire measures perceptions of website usability, it should be able to differentiate between usable and unusable websites and do so consistently over time.