Statistics Norway, The UK Office for National Statistics, and Statistics Sweden have been working together on a Eurostat Leadership in Quality project: Developing methods for assessing perceived response burden. Based on qualitative research in the earlier phases of the project, question sets to measure both actual response burden and response burden as perceived by business survey respondents were developed and tested both qualitatively and quantitatively in all three countries. The questions measure factors such as what aspects of the survey respondents perceive as burdensome, the perceived usefulness of the survey, the actual time used on collecting information and filling in the questionnaire as well as the number of people involved in completing a survey questionnaire. The tests were carried out on both paper and pencil and on web surveys and show that the questions are well suited to measuring response burden. Measurements of response burden by the use of these questions can also be used to assess the quality of the data collected. In this paper the question sets and the results from the field tests will be presented and discussed. We will also present guidelines on how to measure response burden that were developed based on the research findings in the project.