What do you think is the largest obstacle or challenge preventing effective multi-agency and inter-governmental collaboration for intelligence support to homeland security operations?

Collaboration for HSINT
Part I: What do you think is the largest obstacle or challenge preventing effective multi-agency and inter-governmental collaboration for intelligence support to homeland security operations?
Part II: What would another large obstacle or challenge be, but this time from a tactical perspective?
Part III: Lastly, describe at least two solutions or effective frameworks that are being used (or that can be better employed) to overcome these obstacles and ensure effective inter and intra-agency collaboration for intelligence support to the HSE.

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