H‌‍‍‍‌‍‍‌‌‌‍‌‍‍‍‍‌‍‌‌ow can group observation be different than observi‌‍‍‍‌‍‍‌‌‌‍‌‍‍‍‍‌‍‌‌ng and individual? Are their pro and cons to each‌‍‍‍‌‍‍‌‌‌‍‌‍‍‍‍‌‍‌‌?

H‌‍‍‍‌‍‍‌‌‌‍‌‍‍‍‍‌‍‌‌ow can group observation be different than observi‌‍‍‍‌‍‍‌‌‌‍‌‍‍‍‍‌‍‌‌ng and individual? Are their pro and cons to each‌‍‍‍‌‍‍‌‌‌‍‌‍‍‍‍‌‍‌‌?