Opportunity sampling

• How is opportunity sampling carried out?

  Selecting the sample from people who are available at the time the study is carried out, and fit criteria you are looking for.
• What is a strength of opportunity sampling?

  The method is easy and convenient to carry out.
• What is a weakness of opportunity sampling?

  Members of it have self selected. This is a weakness as any results will only be truly generalisable to that specific group of people, biased results.