Are there three or four?

This picture really represents the issues we have in the work every day.

Update: I have been thinking what we can do if the thing has been like this. I don't really have a solution as it can be easily said that it is 3.5.
 - At lease, the people can swap their position to understand how the other people look at it
 - Maybe based on how to make the benefits maximum to just decide which can bring the best result.

I am welcome to know any solution you think.