In my desktop application, there are two tables presented to the user side by side. Each table displays a list of people. One table displays all the people already assigned to a role (let's call it the target table), the other displays all the people that can be assigned to that role (let's call it source). The people can be assigned to that role by dragging one or more persons (one or more rows) from one table to a another.
Now, my question is, on which side do you intuitively expect the tables to be, the source table on the left side and and the target on the right or the other way round? It would be nice if you can point me to some examples or to what the best practice is.