Forum includes several steps:

• Write a research problem that would be best studied using a probability sample. 
• Discuss why this research problem is best studied using a probability sample, and what type of probability sample you would likely use.
• Write a different research problem that would be best studied using a non-probability sample. 
• Discuss why this research problem is best studied using a non-probability sample, and what type of non-probability sample you would likely use.
• Choose one of the above research problems, and find a peer-reviewed journal article related to that research problem.
• Discuss the sampling strategy/process used in the article.  What details are included, and what information regarding the sampling was ignored?
• 250+ words