When sociologists are choosing what research method to use, it is often said that they consider practical, ethical and theoretical issues. Sociologists' theoretical perspective is likely to have a significant impact on their choice of research methods. For example, positivist sociologists will choose methods that produce quantitative data, as they consider these to be more scientific. These include questionnaires and official statistics. Interpretivists will choose to use methods that produce qualitative data, such as interviews or observations.