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 E pool multi_carrier / swatches / normal / ordered_colour_encoding=baseline draw `multi_carrier:swatches:normal:ordered_colour_encoding=baseline` · variant 0	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 D pool multi_carrier / swatches / normal / ordered_colour_encoding=treatment draw `multi_carrier:swatches:normal:ordered_colour_encoding=treatment` · variant 0
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-right region or the Upper-left region? options Upper-left, Upper-right, Skip answer Upper-right pool multi_carrier / density / normal / ordered_colour_encoding=baseline draw `multi_carrier:density:normal:ordered_colour_encoding=baseline` · variant 0	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 Upper-right region or the Lower-left region? options Lower-left, Upper-right, Skip answer Upper-right pool multi_carrier / density / normal / ordered_colour_encoding=treatment draw `multi_carrier:density:normal:ordered_colour_encoding=treatment` · variant 0
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 R1C5, R2C5, R2C1, R2C2, Skip answer R2C5 pool multi_carrier / heatmap / normal / ordered_colour_encoding=baseline draw `multi_carrier:heatmap:normal:ordered_colour_encoding=baseline` · variant 0	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, R2C1, R1C5, R1C1, Skip answer R1C3 pool multi_carrier / heatmap / normal / ordered_colour_encoding=treatment draw `multi_carrier:heatmap:normal:ordered_colour_encoding=treatment` · variant 0