Even when persons with disabilities decide to cooperate, they may not be trained respondents. Some persons may have a tendency to ramble when they answer questions, introducing a mode effect. This type of measurement problem makes the data incomparable to that of individuals who have more experience being interviewed. Other issues arise when surveying persons with disabilities. The potential exists for measurement errors.
Technology can be a barrier to survey research.
TTYs are not well designed for conducting surveys. Only two lines of text can be displayed at a time. So, survey instruments need to be written specifically for this technology. Finally, the cost of data conversion can be substantial. It is therefore possible to develop other forms of survey errors.