The ability to prevent mistakes is applied by the person by looking at the sample often. A mental representation of the sample (image) is formed and used to compare with their uncolored design.
Select the behaviour that most closely matches your observations:
Decision Body
Looking at the sample prevents mistakes in the beginning but mistakes are made later on or the person stops colouring before all of the triangles are completed (ACL 4.6).
Looking at the sample continues to prevent mistakes until colouring the design is completed. Triangles are coloured one at a time (ACL 4.8).
The person forms an image of a red and / or yellow diamond and colours across adjacent triangle lines within those boundaries (needs verifying with Design C from the copying activity) (ACL 5.0).