Research methods can be qualitative, quantitative, primary or secondary in nature. Interviews provide in-depth answers specific to questions but are time consuming and not suitable for large samples. Questionnaires can collect large amounts of information from many people quickly but may lack validity and understanding of emotions. Focus groups of 10 people discuss products or ideas, but are expensive to conduct and participants may not express opposing views. Surveys can provide information from many cost-effectively but respondents may not feel comfortable providing minority answers or encouraged to respond accurately. Internet research is quick but material is not always evaluated by experts, while library research accesses peer-reviewed sources but resources may not be available to take out.