What element is necessary for a chart to be effective for students?

The effectiveness of a chart in an educational context hinges on whether it makes sense to students. A chart serves as a visual representation of data, and if students cannot comprehend the information presented, the chart fails to fulfill its purpose. Making sense to students means that the chart conveys information in an understandable way, reflecting their level of familiarity with the topic or type of data. This comprehension can be supported by clarity in the design, appropriate labeling, and a logical arrangement of information that resonates with the students' learning needs.

While formatting rules, consistency of data type, and color coding can enhance the usability and attractiveness of a chart, they do not guarantee understanding. If the content is not relatable or interpretable for students, no amount of design can compensate for that lack of clarity. Hence, the key element in ensuring a chart effectively communicates its message is its ability to be understood by the intended audience.