Domain: Healthcare — Pharmacy
Target concept: Tablet Disintegration Effect: Starch vs. No Disintegrant (in Water)

Video generation prompt: Place two identical white tablets into still water: the tablet in the left transparent bowl contains a starch disintegrant, while the tablet in the right transparent bowl does not contain a disintegrant.

Evaluation guide:
(i) Target concept: Differential tablet disintegration driven by presence/absence of starch disintegrant in aqueous medium.
Minimum mechanism: Water must be still and sufficient to submerge tablets; starch-containing tablet must exhibit rapid, surface-initiated mechanical breakdown (not dissolution or chemical reaction); non-disintegrant tablet must resist hydration-induced structural failure over the observation window.
(ii)Storyline: Frame 0–1: Two identical white tablets held above two side-by-side transparent bowls of still water. Frame 2–3: Simultaneous placement into water with gentle contact (no splash). Frame 4–9: Left tablet develops visible surface cracks or particle release; right tablet retains sharp edges, uniform surface, and geometric integrity; both bowls remain stationary, fully visible, and evenly lit; no occlusion, no camera movement, no water disturbance.

Manual:
Experimental Procedure
1. Place two identical matte-white cylindrical tablets (same size, shape, imprint) simultaneously into two identical transparent cylindrical bowls filled with still, clear water.
2. Position bowls side-by-side in fixed frontal view, left bowl containing starch-disintegrant tablet, right bowl containing no-disintegrant tablet.
Observation of Experimental Phenomena
- Left tablet shows progressive physical disintegration: surface cracking, edge erosion, or particle shedding into water.
- Right tablet remains fully intact: no cracking, no erosion, no shedding, no shape distortion.
Summary of Experimental Principles
Starch acts as a hydrophilic disintegrant that rapidly absorbs water, swells, and generates internal stress, causing tablet matrix failure. Without disintegrant, the tablet remains cohesive due to insufficient capillary force and binder dominance.

Prompt Grounding rubric:
level_1: Two identical matte-white tablets are not both shown, or the two transparent bowls of still water are absent, merged into a single container, or not placed next to each other on the table; no tablet is ever lowered into water in the clip.
level_2: Two transparent bowls of water sit next to each other, but the two tablets are not visually identical (they differ in color, size, or shape from one another), or one bowl has no water in it, or a tablet is placed into only one bowl while the other bowl never receives a tablet, or the water in a bowl is already disturbed or moving before any tablet touches it.
level_3: Two visually identical matte-white tablets are lowered into two side-by-side transparent bowls of still, clear water in one synchronized motion (no dropping from height, no splash from the entry itself); both bowls stay fully visible on screen and evenly lit for the whole clip; the camera holds one fixed frontal framing that keeps both bowls in view together.
level_4: All elements of 3-score are present, and the left bowl and the right bowl each keep the same position relative to the camera and to each other for the entire clip (neither bowl is relocated, swapped, or ever hidden behind the other bowl or behind a hand); the lighting stays even across both bowls throughout, with neither bowl going dark nor catching glare that the other bowl does not.
level_5: All elements of 4-score are present, and at every moment in the clip a viewer can tell which bowl is the 'left' one and which is the 'right' one purely from its position in the frame (since the two tablets look identical, position is the only cue available); no hand, arm, or other object ever blocks either bowl from view; the water level and bowl rim in each bowl stay visibly steady throughout, with no camera pan, zoom, or cut that would interrupt the continuous side-by-side view the setup requires.

Scientific and Causal Correctness rubric:
level_1: The left tablet (stated to hold the starch disintegrant) and the right tablet (stated to hold no disintegrant) end the clip in the same condition as each other (both still whole, or both broken apart), so the tablets' stated compositions have no visible effect; or the tablet that visibly breaks apart is the right one rather than the left one.
level_2: Only one tablet changes at all, but the change does not fit a disintegrant-driven breakup: for example the left tablet merely shrinks or dissolves smoothly from the outside in rather than cracking or shedding pieces, or the right tablet also shows cracking, crumbling, or softened edges instead of staying intact, which erases the contrast the prompt sets up.
level_3: By the end of the clip the left tablet shows at least one clear sign of falling apart (a visible crack across it, crumbled edges, or loose fragments settled in the water beneath it), while the right tablet's outline, edges, and overall shape look the same as when it was first placed in the water.
level_4: All elements of 3-score are present, and the left tablet's breakup looks like it is being pushed apart from the inside (fragments separating outward as if something inside absorbed water and swelled), rather than smoothly dissolving or melting away from the surface inward; the right tablet shows no pitting, no crumbling, and no softened edges at any point in the clip.
level_5: All elements of 4-score are present, and throughout the clip the left tablet's fragments and the water around them stay the same white/clear color as at the start (no dye leaching out, no fizzing or bubble stream, and no cloudy discoloration beyond the visible solid fragments themselves), while the right tablet keeps an unbroken outline and unchanged surface texture from the first frame to the last, so the only difference between the two bowls is traceable to the stated presence or absence of the starch disintegrant.

Spatiotemporal Consistency rubric:
level_1: Between one frame and the next, a bowl or a tablet jumps to a new position with no motion shown connecting the two spots (e.g., a tablet is above the water in one frame and already resting on the bottom of the bowl in the next with no descent shown); the water's height in a bowl visibly jumps up or down between frames with nothing entering or leaving the bowl to explain it; or the lighting on the bowls shifts abruptly between frames, such as a shadow vanishing and reappearing pointing a different way, with no visible cause.
level_2: A tablet's descent into the water skips visible steps (it appears to jump from mid-air to fully submerged with no entry frame shown); one of the two bowls shifts to a different spot on the table partway through the clip; the water surface briefly shows ripples and then reverts to perfectly flat with no cause shown for either change.
level_3: Each tablet's entry into its bowl is shown as one continuous downward path from hand or holder to the water's surface, with no skipped segments; both bowls stay in the same spot on the table for the entire clip; the still water's height in each bowl stays constant except for the brief, local disturbance directly caused by that tablet entering it.
level_4: All elements of 3-score are present, and each tablet's descent visibly slows as it meets the water's resistance (no bouncing back up out of the water, no instantly halting mid-air); the bowls' rims and the tablets' outlines stay geometrically stable, neither stretching nor bending, as the camera holds its view.
level_5: All elements of 4-score are present, and any fragments that come loose from a tablet drift and settle in the water along a continuous, physically consistent path (no fragment jumping from one spot to another between frames); whichever tablet stays intact remains motionless at a fixed position and depth in its bowl for the remainder of the clip, and the two bowls' left/right placement relative to each other never shifts.