Shapes and matrices make up two of the visual components of performance IQ. These indicators are assessed in two separate test sections: block design and matrix reasoning. Block design questions ask test takers to determine what 3-D shape would be formed by folding the flaps up on a 2-D sheet. Matrix reasoning questions ask test takers to predict which image comes next in a series of images that changes according to a set rule. These test sections indicate the test taker's ability to mentally manipulate images without the help of notes.
Picture completion is a another visual component of the WAIS. In the picture completion section, test takers are asked to determine which of several smaller images can be used to fill in a larger image with a gap. The test taker's results in this section further indicate his ability to work mentally with images; however unlike in the block and matrix sections, the picture completion results have to do with complex images, instead of simple shapes.
Numeracy is a component of most modern IQ tests, including the WAIS. In the numeracy section of the WAIS, test takers are shown series of digits and symbols, and they are asked to match a digit with a new symbol, in keeping with the pattern. This section of the WAIS indicates two aspects of performance intelligence: computation speed and pattern recognition ability. Both are crucial elements of crystallized intelligence.
The symbol search section of the WAIS is similar to the numeracy section, except that instead of having test takers match numbers with symbols, it simply has them match symbols with other symbols. In symbol search questions, a test taker might be asked (for example) to match the image of a glove with the correct image out of an inventory consisting of a hand, foot and head. The test taker's results on the symbol search section indicate her ability to understand abstract symbolism.