Rotation
Elements rotate around a fixed point by a constant angle each step. The most common single rule in EPSO abstract reasoning.
Understanding this pattern
Rotation patterns involve one or more elements turning clockwise or anti-clockwise by a fixed number of degrees between each frame. An arrow might rotate 90° per step, or a dot might orbit around the perimeter of a square. The key is measuring the angle between two consecutive positions and verifying it stays constant. About 40% of EPSO abstract reasoning questions involve at least one rotation.
Example Question
Pattern Rule
A single asymmetric figure (e.g., an arrow or L-shape) simultaneously rotates by a fixed angle (90° clockwise) at each step AND moves one position forward along a fixed clockwise path around the outer cells of a grid. These two transformations—rotation and positional displacement—must both be tracked to identify the correct next frame.
Explanation
Option E is correct because it is the only choice that satisfies both constraints at once: the figure occupies the next cell along the clockwise positional path AND its orientation reflects a further 90° clockwise rotation from the previous frame. The wrong options are each tempting for a specific reason: some show the correct position but the wrong rotation (a common trap for candidates who track movement but forget to rotate), while others show the correct rotation but place the figure in the wrong cell (the reverse error). This question belongs to the 'compound transformation' family, where the difficulty scales with the number of independent rules that must be composed — missing either the path rule or the rotation rule leads to a plausible-looking but incorrect answer.
How to spot it
- An element appears in different orientations across frames
- A dot or marker moves to adjacent positions around a shape boundary
- The overall shape stays the same but its angle changes systematically
Common traps
- Confusing clockwise and anti-clockwise rotation — check frames 1→2 vs 2→3
- Assuming 90° when the actual step is 45° or 60°
- Missing that two elements rotate at different speeds (see: dual-speed)
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