Domain: Engineering — Electrical Engineering
Target concept: When a single button is pressed, the LED does not light up. When both buttons are pressed simultaneously, the LED lights up momentarily, and turns off immediately when either button is released.

Video generation prompt: Build a two-input AND gate circuit on a breadboard (with two input terminals). Use two buttons as inputs and an LED as the output. First, press each button individually once, then press both buttons simultaneously, and observe the state of the LED.

Evaluation guide:
(i) Target concept: Binary combinational logic implemented via physical switch-LED circuit; minimum mechanism: electrical continuity through both switches must be required to complete the LED circuit: no alternative current path, no capacitor/resistor-induced delay, no mechanical bounce artifact affecting observed timing.
(ii)Storyline: Frame-accurate sequence: [0] Static shot showing breadboard with two buttons and LED in resting state (all OFF); [1] Finger approaches and fully depresses Button A only → LED remains OFF; [2] Finger lifts, Button A returns to rest; [3] Finger approaches and fully depresses Button B only → LED remains OFF; [4] Finger lifts, Button B returns to rest; [5] Both fingers approach and simultaneously fully depress both buttons → LED appears ON; [6] One finger lifts → LED disappears instantly; all phases viewed from fixed frontal angle with full component visibility and no occlusion.

Manual:
Experimental Procedure
1. Place two identical push-button switches side-by-side on breadboard; connect each to separate input rail. Connect LED to output rail.
2. Press Button A alone → observe LED.
3. Press Button B alone → observe LED.
4. Press both buttons simultaneously → observe LED lights up.
5. Release either button → observe LED turns off immediately.
Observation of Experimental Phenomena
- LED remains OFF when only Button A is pressed.
- LED remains OFF when only Button B is pressed.
- LED turns ON only while both buttons are fully pressed.
- LED turns OFF instantly upon release of either button.
Summary of Experimental Principles
This demonstrates an AND logic gate: output is HIGH (LED on) iff both inputs are HIGH (both buttons pressed).

Prompt Grounding rubric:
level_1: No breadboard is visible, or fewer than two buttons are shown, or no LED is present, or none of the required press actions (single Button A, single Button B, simultaneous both) are depicted.
level_2: A breadboard, two buttons, and an LED are all visible, but the press actions do not follow the required order (e.g., the simultaneous press appears before either single press, or one of the required press actions is missing entirely); the two buttons are not matching in type or size.
level_3: A breadboard holds two matching push-button switches, side by side, and one LED, all visible in a fixed frontal view; the video depicts, in order: Button A pressed alone and released, then Button B pressed alone and released, then both buttons pressed down together and released, matching the order specified in the prompt.
level_4: All conditions of the 3-point level hold, and no extra or missing components appear (e.g., no third button, no second LED, no stray wires blocking the view of the buttons or LED); the two buttons are visually identical in size, shape, and color, and are placed adjacent to each other on the same breadboard row.
level_5: All conditions of the 4-point level hold, and every press is a clean, full press-and-release with the fingertip making complete contact with the button top (no hovering above the button, no partial or incomplete depression); the LED sits in a fixed, unobstructed position throughout, so its state is visible in every frame regardless of what that state is; camera framing keeps the breadboard, both buttons, and the LED fully in view for the entire sequence.

Scientific and Causal Correctness rubric:
level_1: The LED turns on during a single-button press (Button A alone or Button B alone), or the LED never turns on even when both buttons are pressed together, or the LED stays lit after both buttons have been pressed and one is later released, or the LED's behavior shows no relationship to which buttons are pressed.
level_2: The LED occasionally behaves correctly but breaks the AND logic at least once: it flickers on briefly during a single-button press, it stays lit for several frames after one button is released during the simultaneous phase, or it turns on before both buttons have made full contact.
level_3: The LED stays off throughout the Button-A-alone press and throughout the Button-B-alone press; the LED turns on only once both buttons are simultaneously and fully pressed down; the LED turns off as soon as either button is released, with no lingering illumination.
level_4: All conditions of the 3-point level hold, and the LED's on-state color stays constant (no hue shift between on-events) and its brightness is uniform across the LED's surface; the LED shows no unintended flicker during a finger's approach or lift-off, only responding to actual button contact and release.
level_5: All conditions of the 4-point level hold, and the LED's on/off transitions track button contact with no partial or dimmed intermediate state at any point in the sequence: the LED is either fully off or fully and evenly lit in every frame, correctly reflecting the AND relationship (on only when Button A and Button B are both down) across the entire clip.

Spatiotemporal Consistency rubric:
level_1: The breadboard, a button, or the LED shows up in a new position or drops out of the frame and then reappears elsewhere, with no visible motion connecting the two states; a component's apparent size suddenly changes with no transition; the scene's overall lighting flips from dark to bright, or the reverse, within a single frame with no cause tied to any action; or a wire or button visibly snaps, detaches, or breaks apart from the breadboard.
level_2: A button or the LED visibly shifts position or tilts between the individual-press phases and the simultaneous-press phase even though nothing in the action should move it; the LED appears to briefly flicker for no reason tied to button state; the on-screen lighting brightens or dims noticeably between phases without cause.
level_3: The breadboard, both buttons, and the LED stay in the same position, size, and orientation across the entire sequence; the background and overall lighting remain steady throughout; each finger's approach, press, and release is a continuous, physically plausible motion with no jumps.
level_4: All conditions of the 3-point level hold, and each finger's approach to a button is a smooth, gradual motion with no sudden jump-cut from 'approaching' straight to 'fully pressed'; when a finger presses a button, contact looks complete, with the fingertip fully covering the button top rather than a partial graze; the LED stays visible and unobstructed by the finger throughout every press, including the simultaneous press.
level_5: All conditions of the 4-point level hold, and the two buttons remain side by side on the same breadboard row and the LED remains in the same fixed position relative to them throughout the entire clip; each finger's motion follows a smooth, natural path toward and away from its button without unnatural speed changes; the breadboard, buttons, and LED show no visible wobble, shift, or shake at any point in the sequence.