The study in the article was designed to compare two different cognitive behavior therapies and their outcomes. Researchers used convenience sampling to find participants for the study by placing fliers in 16 mental health clinics in the Netherlands and allowing interested parties to apply for inclusion. A list of criteria was also used to narrowly focus the study to a particular population. The sample size admitted into the study was 159 adolescents between the ages of 12-17. To increase the validity of the sample, adolescents were randomly placed into two groups and then stratified into smaller groups based on medication and gender. In order to reduce risk to participants, adolescents with comorbid disorders that may need more treatment than was being provided, were excluded. Both parents and adolescents were required to provide informed consent in order to …show more content…
For this study school administrators and teachers were contacted in nine different countries and asked to fill out questionnaires. If there were questions about content, researchers responded with phone calls and emails to give additional information. The sample of 2,307 teachers voluntarily completed either an online, paper, or telephone questionnaire that contained thirty-six questions. They also responded to demographic questions. The sample represented urban, suburban, and rural area schools. Questionnaires were translated into several languages. The translation process can lead to slight variances in questions which may affect responses. In most countries, the teachers were not compensated for their participation, although in a few countries there was minimal monetary