Introduction

The base drill builds the scan habit. This variation audits it. A player can pass the base drill with a beautiful, empty head turn — the head moves, the eyes register nothing, the touch goes to a cone chosen in advance. This variation makes that impossible: during the ball's flight, a signaller shows a brief signal — fingers raised, a coloured bib, an arm position. The receiver must call out what they saw before the first touch, and the touch direction is determined by the signal.

No real scan, no correct call. The drill now measures what the base drill could only encourage. This is the constraints-not-commands principle doing the enforcement: nobody has to demand better scanning — the signal window makes genuine looking the only path to a correct rep.

Setup

Identical footprint to the base drill, one role added (8m × 4m flat surface).

        Cone L (red)                          Cone L (red)
           •                                     •

    [Server] ←———————— 5 m ————————→ [Receiver]

           •                                     •
        Cone R (blue)                            Cone R (blue)

                                          [Signaller]
                                       (2–3 m behind receiver,
                                        offset to one side)

Server and receiver: facing each other on a centre line, 5 m apart, each with two flanking cones ~2 m to their left and right — exactly as in the base drill.
Signaller: stands 2–3 m behind the receiver, offset left or right (rotating sides each block). Their signals are visible only over the receiver's shoulder — i.e., only on a genuine scan.
Two-player version: the server doubles as signaller, holding the signal hand up as they pass. Easier (signal is in front), still loaded; use it when no third player is available.

Description

One rep:

Server passes firmly along the ground to the receiver.
During the ball's flight, the signaller briefly shows a signal — e.g. one / two / three fingers, or a red / blue card — then lowers it before the ball arrives. The signal lives for roughly one second.
The receiver scans over the shoulder on the signaller's side, reads the signal, and — before or with the first touch — calls it aloud ("two!", "red!").
The signal maps to a touch direction agreed before the block (e.g. one finger / red = left cone, two fingers / blue = right cone). The first touch goes to the signalled cone.
Second touch returns the ball to the server. Wrong call or missed signal: the signaller simply states what it was, and the next ball is already coming. The miss is the data; there is no other consequence.

Blocks:

Block 1 (4–5 min): receiving foot fixed — right. Signaller swaps sides halfway.
Rest (30 s): receiver and signaller swap or rotate (3-player version rotates all roles every block).
Block 2 (4–5 min): receiving foot fixed — left.
Closing reflection (2 min).

Rhythm rule: continuous, like the base drill. The signal window only trains under flow; a drill that pauses between reps lets the player pre-aim their scan and the load evaporates.

Progressions

Level 1 — Baseline. Two-option signal (one / two fingers), signaller behind, generous one-second window, fixed mapping. As described above.
Level 2 — Three options. Three signals, three touch targets (third cone behind the receiver — now with the report layered on).
Level 3 — Shrinking window. The signal shows for roughly half a second, later in flight. The scan must be timed to the signal, not just to the ball.
Level 4 — Inverted mapping. The call states what was seen, but the touch goes to the opposite target ("red!" → blue cone). Response inhibition on top of working memory — the player must override the obvious.
Level 5 — Double signal. Two signallers, one behind each shoulder, both signal; only the one matching a pre-agreed rule counts (e.g. "only odd numbers", "only the side the server's pass came from"). Full selective attention under match-exceeding load.

Coach guidance

Look for

The call coming before the touch, calm and clear. Late mumbled calls mean the player is buying time by slowing the rep.
The scan staying quick — one sharp look, not a long stare that loses the ball. The skill is extraction speed, not gaze duration.
Call accuracy holding up on the weak-foot block. Accuracy that collapses when the foot changes tells you the motor task is still consuming all the attention — stay at this level.
The signaller's timing: signals shown too early or held too long quietly delete the drill's difficulty. Coach the signaller too.

Cues to give

"Say it before you touch it."
"One look — what did you see?"
"Quick eyes, quiet feet."
(to the signaller) "Show it while the ball flies — not before."

Praise (process, not outcome)

"Wrong cone, right call — the scan worked, the feet will catch up."
"You kept calling on the weak foot. That's the rep that counts."
"Good timing, signaller — that window was honest."

Don't fix yet

Heavy touches in the first sessions at a new level — attention is paying the new cognitive tax; the touch recovers as the load automates.
Hesitant volume on the calls. Confidence arrives with accuracy; demand clarity, not loudness.
Occasional missed signals at the hardest timing. If every signal is missed, the window is too tight — loosen it; that's design, not the player.

Watch points

Late, mumbled calls. The player is slowing the rep to buy time. Cue: "Say it before you touch it."
A long stare instead of a sharp look. Gaze duration is not the skill; extraction speed is. Cue: "One look — what did you see?"
Call accuracy collapsing on the weak foot. The motor task is still eating all the attention — hold this level rather than progressing.
Signals shown too early or held too long. This quietly removes the difficulty; redirect the signaller: "Show it while the ball flies — not before."
Every signal missed at the hardest timing. The window is too tight — loosen it. That is a design fix, not a player fault.