What is the purpose of 多 in 你多与别人就此事沟通? I have a sentence with a given translation, as follows: 

你多与别人就此事沟通。 = You communicate with other people.

Why is 多 put into this sentence, it is not mentioned in the translation. 
What would be the difference between the given sentence and the same sentence without the 多?

你多与别人就此事沟通    &lt;> 你与别人就此事沟通  ?
It is a polite way to make suggestions, e.g.

我建议你多运动。
I suggest you to do sports/exercises.  


or

请你多指教。
Please give some guidance/opinion.


So I guess, a more proper translation of you example would be: 'You should contact other people about this issue.'