According to your text,if you were examining an existing social policy,which data collection tool would be the most useful in the social welfare field?

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A longitudinal survey is the most useful data collection tool in the social welfare field when examining an existing social policy as it collects data over a period of time, allowing for changes and trends to be tracked. This can provide valuable information about the effectiveness and impact of social policies on individuals and society over the long term. Opinion surveys, think tanks, and focus groups may provide valuable insights, but they are typically more limited in scope and may not offer as comprehensive a view as a longitudinal survey.

According to Your Text,if You Were Examining an Existing Social