The ability to use visuals well in technical communication is incredibly valuable-- this means that you need to determine when to use your visuals, and how to select the correct visuals to suit your reader's preferences. You should also be able to create tables, graphs, charts, illustrations, photographs, and videos. Color use is also important, and ethical issues should be addressed as well. Cultural considerations should also be made in terms of selecting the correct visual.
No matter what medium you are creating, visuals can make or break your document's effectiveness. Visuals help illustrate the real meanings behind your writing, too. Visuals can also help the audience answer a series of questions they may be thinking (Lannon, pg. 248):
- Which information is most important?
- Where, exactly, should I focus?
- What do these numbers mean?
- What should I be thinking or doing?
- What should I remember about this?
- What does it look like?
- How is it organized?
- How is it done?
- How does it work?
Your visual will help your audience see the bigger picture in your writing, as it conveys the meaning quickly and efficiently. Technical data and information can also be difficult to understand in written form, which is where visuals like graphs, charts, and tables come into play. However, you should remember that visuals will enhance your document, not replace it-- so don't change something about your writing to accomodate a particular visual!
In order to choose the right visual for your document, you should consider a few things. The reason for using the visual is important and can vary based on the topic. If you are conveying facts, a table would probably be the best choice, but if you want your audience to be able to draw conclusions from the visual, a graph is probably better. If you are showing parts of some object, you should use some sort of diagram, or a labeled photograph. If you were to give directions, use a diagram, and relationships should be shown by a flowchart or graph. Your audience should also be considered when selecting a visual. Experts will prefer some complex schematic, will a general audience will prefer something basic.
Tables are very powerful forms of displaying specifications or comparisons. Numerical tables represent quantitative information, while prose tables show qualitative information. A table shouldn't be too complex for its audience, too.
A graph changes numbers into shapes or patterns. Graphs show approximate values and, more importantly, the overall meaning that is conveyed by those values. They are incredibly useful for showing comparisons, changes over a time period, or trends in a data set.
Bar graphs are even easier to understand, and they generally show discrete comparisons (such as year by year or month by month). Ear bar will represent a given quantity, and they tend to focus on value comparisons over a time period. A simple bar graph shows only one trend, while a multiple-bar graph can display two or three trends at once. Horizontal-bar graphs are best for showing large series of bars, while stacked-bar graphs show how much each data set contributes to the whole. 100-percent bar graphs also shows values of a part that make up 100-percent on either horizontal or vertical bars. 3-D bar graphs are also an option.
A line graph accommodates more data points than a bar graph, so it helps show the reader more information. Line graphs can be simple or multiline, and a deviation line graph extends the vertical scale below the zero baseline so that both positive and negative values can be viewed. A band or area graph shades the area under the line, and is great when you want to highlight specific information. Multiple-band graphs depict essentially the same idea.
Although the words chart and graph are used interchangeably, a chart shows relationships, quantitatively or cause-and-effect that are not plotted on standard coordinate systems. Pie charts are very easy for most people to understand, as they display relationships are percentages or parts of a whole. This makes comparison easy. Organization charts show hierarchy and relationships between different departments or elements of a project. Flowcharts trace a procedure from start to finish, and tree charts show how parts of an idea or concept relate to one another. Gantt and PERT charts are very useful when completing project planning, as they both track the performance and scheduling of a given project. Pictographs are special because they use symbols or other graphic items, rather than just lines or bars.
Graphic illustrations are any type of visual that relies more on pictures than data or words. Diagrams are effective because they shows how items function or how they are assembled. Exploded diagrams show how parts are assembled, while cutaway diagrams show what is inside of a given object or part. Block diagrams are essentially simplified sketches that represent relationships between particular processes or systems. Maps are also helpful because they can show comparisons or help the reader visualize a location or position.
Photographs are sometimes better than diagrams because they give the reader a scope of everything, which is helpful when you want to see what something looks like or how something is done. Videos are another way of allowing the reader to actually see how to perform a task, and also give a sense of scale as it shows both the object and the person using it.
There are also several ethical considerations to be made when adding visual documents as well. Your visual relationships should always portray your data, and when using graphs, begin your vertical scale at zero and never compress the scales to get your point across. Your visual should also present the complete picture, while including all essential data without it being bogged down in needless information.
Visuals may also serve as a universal language, so to speak, but this only applies when the graphic in use is not misinterpreted. Colors mean different things to different cultures as well, and hand gestures may cause even more problems. Adequate researching should be done before adding any sort of visual to a document that will be viewed by a global audience.
Group Discussion Question: What is your favorite type of visual to use in a report? What aspects do you like about that particular type of visual aid?