Here is a link to some practical approaches for encouraging and developing effective dialogue between partners:
Dialogue: practical approaches for encouraging and developing it
The link takes you to a free chapter from Timo Järvensivu's book Managing (in) Networks: Learning, Working and Leading Together
As Timo's chapter makes clear, dialogue emphasises "listening to understand", which encourages people to travel to the centre of issues and discover uncomfortably challenging facts and previously unspoken assumptions. "Listening to understand" discourages conversations where people are tempted to debate around issues and seek conveniently supportive facts and clearly victorious arguments.
When working in collaboration, the knowledge gained by engaging in dialogue rather than debate often leads to superior achievements. This is because dialogue encourages people to make a decision or take an action based upon realism and the confidence that they have considered all sides rather than upon idealism and the hope that they have backed the right side.