A.M.
Jill an Lisa are correct...
I just want to "stress". us Type A's love control. Even if I'm not the Lead in the project, I want to know what, how much, where my control begins and ends. If you tell me to find information on how to build a bird house...I'm going to freaking build a bird house. If you don't want the bird house built, you've got to tell me when you assign the task. If I don't get a beginning and ending set of rules I'm running with it and doing it my way.
Give them each tasks with a clear set of rules. If not you will most likely get more than you asked for. i.e. the bird house is done.
Added: And if you can avoid pairing them together...that is good as well.