The image shows three overlapping circles, making a Venn diagram with two circles on the bottom, slightly left and right, and one circle centered and higher. Each circle is shaded a different color and the overlapping regions are also all different colors. The circles overlay so there are four overlapping regions near the center: three with only two regions overlapping, and the center with all three regions overlapping.

The circles represent knowledge in each of three areas: technology, content, and pedagogy. The overlapping regions represent the complex and specific knowledge required to work effectively in the overlapping region; for example, the region that includes both content and pedagogy represents the specific knowledge that an effective teacher uses to coordinante and combine subject-specific content knowledge and age-appropriate and subject-appropriate teaching practices (pedagogy) to engage learners. Each region is labeled, either inside the region or outside the Venn diagram; if outside, there is a line with an arrow at the end indicating the region to which the label refers.

The image also has a large dashed blue circle around the outside of the Venn diagram and the labels.