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When using colour as a coding mechanism, the number of colours used should be:
a. 7 or fewer b. 9 or fewer c. 6 or fewer d. 8 or fewer
Potentially a question for cognisc Stack Exchange but this question relates to the amount of colours a user can perceive at a given moment and in terms of UX, I guess, assigning colours to categorise elements.
For example, how many colours can the human brain take in at a given moment of time without over-complicating a design. For example, according to Dr Halberda (2006) colour plays a major role in catching the attention of people. One can select and attend up to 70 items at once if they are of the same colour. Colour-coding helps to keep things organised and simple. But what Halberda failed to account for is how many colours can be categorised at a given moment in time.
These are the only answers providing by the organisation body so unable to give a min or max answer. The meaning of fewer is less