Rotations of less than how many degrees are not considered errors in BD?

In the context of visual perception and spatial processing as assessed by the Block Design (BD) subtest of the WISC-V, rotations of less than 30 degrees are not counted as errors. This standard is established to account for minor discrepancies that are within a reasonable range of tolerance when children are manipulating blocks to replicate designs.

Rotations of 30 degrees or more typically reflect a misunderstanding of the spatial relationships involved in the task, indicating that the child may not be appropriately interpreting the design elements. By setting the threshold at 30 degrees, the assessment focuses on significant deviations that could affect a child's performance and understanding of spatial relationships, thus ensuring that the test results accurately reflect their abilities in visual-motor integration and reasoning.

Understanding this threshold helps in interpreting a child's performance on the Block Design subtest while allowing for small variations that may occur naturally in the execution of the task.