Demographic information includes geographic area, age, income, race, gender and education level. It also includes shopping habits, marital status, number of children and other information about consumer characteristics.

Whether the demographics describe national or local markets or small groups such as those within an age range, the information helps you avoid the hit-and-miss marketing method.

You can clear up a lot of questions by using diagrams and illustrations

testing the instructions. It’s important that you as the author to practice the instructions you write, but it’s even more important that you get someone else with little to know experience on the subject to follow the instructions

Create a title that explains what the instructions are  "How to...." Use action verbs in the beginning   "Pick up, take, hold...." Use short clear sentences with words that are common. Avoid words with more than one meaning. Make sure to include any cautions, warnings, or dangers. Be Specific.

continuance or flow is that when our eyes start moving in one direction, they tend to continue along that path until a more dominant feature comes along

greater the difference between a graphic element and its surroundings, the more that element will stand out

isolation promotes emphasis

Contrast is defined as the juxtaposition of dissimilar graphic elements, and is the most common method used to create emphasis in a layout

Contrast

Proportion

Proportion is a principle of design that has to do with differences in the scale of objects