Why is it importnat to ensure arange of people and or group with in the issues being researched are consulted?

Question

Why is it importnat to ensure arange of people and or group with in the issues being researched are consulted?

Answer 1

That way, the sample group (the group being researched) will more closely mirror the population at large.  If the group being researched only has one type of people, you might miss some critical variation that a wider range of people would have caught.