Domain: Humanities and Social Sciences — Economics
Target concept: Inflation characteristics: The price index curve continuously rises along the time axis.

Video generation prompt: A simple price inflation index chart is presented, with the horizontal axis representing time and the vertical axis representing the index value. As the average price rises, data points for each period are added sequentially, and the curve is updated step by step.

Evaluation guide:
(i) Target concept: Inflation as a cumulative, time-ordered increase in general price level.
Minimum mechanism: A functional index requires (a) discrete time periods mapped to horizontal positions, (b) scalar price-level measurements mapped to vertical positions, and (c) monotonic mapping such that later time → higher index.
(ii)Storyline: Frame 1–2: Clean blank canvas → axes fade in (horizontal bottom, vertical left), labeled implicitly or explicitly.
Frame 3–4: First point appears at lower-left quadrant; no curve yet.
Frame 5–6: Second point appears to the right and above first; a straight or gently curved segment connects them.
Frame 7–8: Third point appears further right and higher; curve extends smoothly to meet it.
Frame 9–10: Final curve is complete, unbroken, and strictly ascending; all points remain visible and fixed.
Perspective/visibility constraints: Fixed front-facing 2D chart view; no camera movement, zoom, or occlusion; all elements fully visible and non-overlapping; no extraneous UI, legends, or decorations.

Manual:
Experimental Procedure
1. Draw horizontal axis labeled "Time" and vertical axis labeled "Price Index".
2. Plot first data point near bottom-left; draw short rising segment to second point.
3. Add third point further right and higher; extend curve upward and rightward.
Observation of Experimental Phenomena
A line graph appears with time on x-axis and price index on y-axis; data points appear sequentially left-to-right; curve rises continuously without dips or plateaus.
Summary of Experimental Principles
Inflation is reflected in a continuously rising price index over time — each successive period shows a higher index value, resulting in a monotonically increasing curve.

Prompt Grounding rubric:
level_1: No horizontal time axis and no vertical price-index axis are present; no data points appear; no curve is drawn; the video shows unrelated content instead of a price-index chart (e.g., a static image, text only, or an unrelated graphic).
level_2: Only one axis is visible (either the horizontal or the vertical one), and neither axis is oriented or labeled as time or price index; no data points appear anywhere; no line segments are drawn; nothing is added to the chart as the video plays.
level_3: A horizontal time axis and a vertical price-index axis are both present and correctly oriented (time along the bottom, index along the side); at least two data points appear with a line segment connecting them; however, the points do not appear one at a time as the video plays; instead they are all present from the start, or they appear in an order that does not run left to right.
level_4: Both axes are present and correctly oriented, with labeling (explicit text or unambiguous position) identifying time and price index; at least three data points appear one at a time, added in left-to-right order as the video progresses, each followed by its connecting line segment; the chart contains no extraneous elements such as bars, pie slices, legends, or unrelated gridlines.
level_5: Everything required at the 4-point level holds, and in addition each new point and its connecting segment are drawn only after the previous point and segment are fully in place and stationary: points never flash in together, an already-plotted point is never erased or redrawn, and no point or segment visibly jumps or overlaps another during the build-up.

Scientific and Causal Correctness rubric:
level_1: The plotted curve trends downward, stays flat, or moves up and down over time instead of climbing; or points appear with no visible link between moving rightward (later time) and moving upward (higher index), e.g., points are scattered with no left-to-right upward trend.
level_2: The curve trends upward overall, but at least one later point sits level with or below an earlier point, creating a visible dip or flat stretch in the line; or the axes are swapped, with time running vertically and index running horizontally.
level_3: Every point sits visibly higher than every point to its left, so the curve climbs steadily with no dips; however, nothing in the video ties this climb to the passage of time: for instance, all the points are already present at the start rather than being added one by one as time moves forward, so the video doesn't actually show 'later time leads to higher index' happening.
level_4: Every point sits visibly higher than the one immediately before it, the points are added one at a time in left-to-right (time) order so the price index is shown climbing as time advances, and the connecting curve stays smooth and unbroken with no point ever dropping to or below an earlier point's height.
level_5: Everything required at the 4-point level holds, and in addition the rising relationship holds without exception for the whole video: no already-plotted point shifts height after later points are added, no point overshoots and then settles back down, and each newly added point is clearly and visibly higher than the point right before it for as long as it stays on screen.

Spatiotemporal Consistency rubric:
level_1: Severe continuity breaks: the axes suddenly change size or position; a point blinks into view with no drawing motion leading up to it; the curve appears to redraw itself backward or jump across the chart; the viewpoint shifts, zooms, or rotates partway through the clip.
level_2: Clearly noticeable flaws: several points snap into place instantly with no fade-in or draw-in motion; the pacing of the drawing is visibly uneven, for example, one line segment is drawn almost instantly while the next lingers on screen far longer with no apparent reason; axis labels reposition or flicker partway through the sequence.
level_3: The axes stay in the same position and orientation for the whole clip; each point appears at a stable spot relative to the axes and to previously drawn points; the curve is drawn continuously from left to right without reversing or leaving a visible gap; the chart's framing and background stay visually the same throughout.
level_4: Everything required at the 3-point level holds, and in addition each new point enters the same way every time (for example, always fading in, or always sliding in from the same direction) at a steady, even pace; the curve extends alongside it smoothly, without stuttering, skipping ahead, or freezing momentarily; no point or axis changes size or shape while it appears.
level_5: Everything required at the 4-point level holds, and in addition the whole sequence looks stable start to finish: previously drawn points and curve segments don't shift, blur, or flicker once they're placed; the curve visibly reaches each new point's marker rather than stopping short of it or overshooting past it; every point's entrance takes the same visible amount of time and follows the same visual style, so the pacing looks uniform throughout.