I've been working with TFS for sometime and when you are using the process flows you need to understand how the workflows work with the work items types.
There are two main types I have worked with Agile and CMMI Process Improvements.
I'm not an expert on these workflows but you can get access to the full guidance from:
The diagrams below are taken from VSTS blog site, but you must remember thes eare just starting points and they can be changed to suit your own workflow within your business
MSF for Agile Software Development
featuring 5 work item types: Bug, Requirement, Quality of Service Requirement (QoS), Risk and Task.
Work Item Type: Bug
Work Item Type: Scenario
Work Item Type: Quality of Service Requirement (also known as "technical requirement")
Work Item Type: Risk
Work Item Type: Task
MSF for CMMI Process Improvement
featuring 7 work item types: Bug, Requirement, Change Request, Issue, Review, Risk, Task
Work Item Type: Bug
Work Item Type: Requirement
Work Item Type: Change Request
Work Item Type: Issue
Work Item Type: Review
Work Item Type: Risk
Work Item Type: Task
