Too many cooks spoil the broth
Minimize the number of departments, groups and persons involved in a business process
Reijers, H., & Liman Mansar, S. (2005). Best practices in business process redesign: an overview and qualitative evaluation of successful redesign heuristics. Omega, 33(4)
Employing this approach should mitigate coordination issues. Time saved on coordination can be allocated to case processing. Decreasing department count could reduce shared responsibilities, akin to the split responsibilities approach. Yet, it might hinder expertise development (quality concern) and routine efficiency (cost concern).
Foundational free Patterns
Assign a responsible individual for handling each case type
Establish standardized interfaces
Consider a standardized interface with customers and partners
Delegate and optimize your operations
Move activities to more appropriate places
Consider to deepen or broaden the skills of resources
Consider the division of a general activity into two or more alternative activities
Let products appear greener
Preference-based task assignment
Let people do what they love to do
Allocate task based on past feedback or quality metrics
Reduce the number of contacts with customers and third parties
If capacity is insufficient, consider increasing the available number of resources