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2.0 TERMINOLOGY
2.0.1 Ball Side: The location of the ball in the normal frontcourt offensive
alignment of a team. In dividing the court down the middle, (using the basket as
a center point), end line to end line. The side of the court where the ball is located
is ball side.
2.0.2 Ball-Side Mechanic: Refers to the Lead moving across the key area to
the ball side of the court, on the Trail’s side, resulting in both officials being on
the same side of the court. The Lead moves ball side when the majority of players
and the ball goes below the free-throw line extended on the Trail’s side of the
court. This movement will allow the Lead to get a clear view of post play and eliminate
being “straight-lined.” Primary coverage areas are adjusted when this
occurs.

2.3.3 Ball-Side Mechanic:
A. General Provisions:
1. The use of a ball-side mechanic should be thoroughly discussed at the
pregame conference.
2. Ball and player location key the need for movement by the Lead.
3. The Lead should only move ball-side when the Trail is in the frontcourt.
B. Coverage:
1. When the majority of players and the ball are on the Trail’s side of the
floor, below the free-throw line extended, the Lead should close-down
toward the near lane line and may move laterally to ball-side.
2. Playing action may dictate that the lead NOT initiate movement – even
when the ball is on the Trail’s side – such as on a quick shot or a quick
drive to the basket.
Page 29 2.3 Court Coverage
3. Movement by the Lead
across the lane should be
brisk and with purpose.
4. Even while moving across
the lane, the Lead must officiate
players in the post
(PCA). Lead should not be
caught within the key area
except when moving across
or just briefly to view a play
or drive to the basket from
the Trail side of the court.
5. When the Lead moves
across the lane, the Lead’s
PCA is extended to include
the area inside the arc. See Diagram 2-20.
6. When the ball moves inside the three-point arc, the Lead is now on-ball
and the trail must extend coverage to assist with the open area on the
opposite side. See Diagram 2-21.
7. If the majority of players or the ball swings back to the opposite side,
the Lead should begin to quickly move back across the lane to cover
the play. See Diagram 2-22.
8. If there is a quick shot or drive to the basket and the Lead is still on the
same side of the court as the Trail, the Lead should close down to the
near lane-line extended and officiate rebounding action.
9. If a transition to the other end of the court occurs when the Lead is ballside,
the Lead must remember to go back to the other side of the court
and into diagonal coverage.