The "Relationship Project" offers great resources that will help you achieve this.
Click here to go to the project's website, where you will find resources that will help you do the following:
- Map existing relationships and enhance their effectiveness.
- Identify and develop new and potentially valuable relationships.
- Support and encourage the roles and behaviours that are essential for developing and sustaining effective relationships.
- Learn from others' experiences of developing and sustaining effective relationships.
As a supplement to the above, I have written about the specific characteristics of the relationships that are most likely to underpin successful collaborative working. You can find out about these by clicking here.