[BillyMac]

From my pregame conference with my partner:

Lead’s Primary Responsibilities
Primary coverage area. Post play. Illegal screens at elbows.

Trail’s Primary Responsibilities
Primary coverage area “works the arc”. Weak side rebound coverage. Drives starting in primary. Last second shot, basket interference, goaltending. Bring subs in.

Stay In Your Primary, It Must Be Obvious To Come Out Of Your Primary
If something is there that needs to be called, call it. Seldom should have four eyes on the ball. We’re not going to have too many double whistles if we are doing this right. Keep in mind your boundary line responsibilities and last second shot responsibilities. Put the ball in play where it goes out of bounds,
or where the foul is.

Out-Of-Bounds Help
For out-of-bounds help, let's get it right. Come together for a change if needed. If I have no idea and I look to you for help, just give a directional signal. No need to come to me. Just point. If I signal but I get it wrong, then blow the whistle and come to me. Tell me what you saw and let me decide if I’m going to change it.

Two-Point / Three-Point Shot
If one official incorrectly signals the number of points, the other official will simply blow the whistle immediately, discuss the play with our partner, come to a decision, signal the correct number of points to the table, and resume the game. We will only correct if we are 100% sure.

Last Second Shot
Let’s let each other know when there’s less than a minute in each period. 99% of the time, the Trail will be responsible for the call. Let’s both have an opinion in case Trail’s not sure. How will we handle a full-court pass when the Trail is stuck in the backcourt?

Goaltending And Basket Interference
99% of the time, the Trail will be responsible for the call. Lead can help out on a quick shot in transition, when Trail hasn’t made it into the frontcourt yet. Let’s remember that it’s never basket interference or goaltending to slap the backboard. Coaches and fans always want it, but we can’t award the points.

Press Coverage
Help each other. New Lead will wait at midcourt.

Also, I really like this earlier statement from JugglingReferee, short, to the point, and easy to remember: "If I see something in their area, and it makes me say "Oh, my" then I let it go. If I say, "Oh my God!" then I call it."