Methodology

The survey begins with four colour-vision screening plates and one unrecorded practice question. It then presents 29 measured figure questions covering the design comparisons shown below.

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Multi-carrier replication — Ordered-Colour Encoding

The same baseline/treatment contrast (hue-only qualitative palette vs. a luminance-ordered sequential palette) tested on three different chart types, so the effect can be checked for generalisation rather than being an artefact of one carrier.

swatches	baseline Ordered-value carrier: five labelled samples, each showing one of five ranked values. Ordered-Colour Encoding = baseline (Hue-only palette on ordered data). tokens ordered_colour_encoding = baseline viewing normal prompt Which sample has the HIGHEST value? options A, B, C, D, E, Skip answer A pool multi_carrier / swatches / normal / ordered_colour_encoding=baseline draw `multi_carrier:swatches:normal:ordered_colour_encoding=baseline` · variant 1	treatment Ordered-value carrier: five labelled samples, each showing one of five ranked values. Ordered-Colour Encoding = treatment (Luminance-ordered sequential palette). tokens ordered_colour_encoding = treatment viewing normal prompt Which sample has the HIGHEST value? options A, B, C, D, E, Skip answer E pool multi_carrier / swatches / normal / ordered_colour_encoding=treatment draw `multi_carrier:swatches:normal:ordered_colour_encoding=treatment` · variant 1
density	baseline Ordered-value carrier: a continuous density field with two regions of differing intensity. Ordered-Colour Encoding = baseline (Hue-only palette on ordered data). tokens ordered_colour_encoding = baseline viewing normal prompt Is the density HIGHER in the Upper-left region or the Lower-right region? options Lower-right, Upper-left, Skip answer Upper-left pool multi_carrier / density / normal / ordered_colour_encoding=baseline draw `multi_carrier:density:normal:ordered_colour_encoding=baseline` · variant 1	treatment Ordered-value carrier: a continuous density field with two regions of differing intensity. Ordered-Colour Encoding = treatment (Luminance-ordered sequential palette). tokens ordered_colour_encoding = treatment viewing normal prompt Is the density HIGHER in the Lower-right region or the Upper-left region? options Lower-right, Upper-left, Skip answer Lower-right pool multi_carrier / density / normal / ordered_colour_encoding=treatment draw `multi_carrier:density:normal:ordered_colour_encoding=treatment` · variant 1
heatmap	baseline Ordered-value carrier: a 3x5 discrete reading grid of ranked values. Ordered-Colour Encoding = baseline (Hue-only palette on ordered data). tokens ordered_colour_encoding = baseline viewing normal prompt Which cell has the HIGHEST value? options R2C1, R3C2, R1C1, R3C1, Skip answer R2C1 pool multi_carrier / heatmap / normal / ordered_colour_encoding=baseline draw `multi_carrier:heatmap:normal:ordered_colour_encoding=baseline` · variant 1	treatment Ordered-value carrier: a 3x5 discrete reading grid of ranked values. Ordered-Colour Encoding = treatment (Luminance-ordered sequential palette). tokens ordered_colour_encoding = treatment viewing normal prompt Which cell has the HIGHEST value? options R1C3, R2C4, R1C2, R3C3, Skip answer R2C4 pool multi_carrier / heatmap / normal / ordered_colour_encoding=treatment draw `multi_carrier:heatmap:normal:ordered_colour_encoding=treatment` · variant 1