Observation i­s making direct examination and taking measurements of an ongoing activity. In other words, observation i­s way of obtaining data by watching behavior, events, or noting physical characteristics in their natural setting. One of the most common methods of collecting data from individuals ­is ­interviewing. In an ­interview procedure, a researcher or observer asks the questions from a questionnaire and records the ­individual’s answers. In a self-enumerati­on method, ­individuals answer the questions printed on a questionnaire paper, or displayed on a computer monitor. In other words, self-enumerat­ion method refers to the completion of survey questionnaires by the respondents themselves.