This is a simple way for evaluating the forces pro and con that are at play with regards to certain change. Typically, this is a change the organization is interested in or faces.
This is a method coming from the field of Social Science and developed by Kurt Lewin.
Dave Gray has introduced a map (Force Field Map), which provides an excellent canvas for having a conversation with all participants in front of a flipchart or whiteboard.
Check out these great links which can help you dive a little deeper into running the Force Field Analysis - Force Field Map practice with your team, customers or stakeholders.