BEC口语：what is important when producing a market plan?

当制定市场计划时,什么是重要的?
回答啊,我在网上节选了几段,你也可以去看看吧：
Psychographics
This is the study of how the human characteristics of consumers may have a bearing on their response to products,packaging,advertising and public relations efforts.Behavior may be measured as it involves an interplay among these broad sets of variables
Predisposition - What is there about a person's past culture,heredity or upbringing that may influence his or her ability to consider purchasing one new product or service versus another?
Influences - What are the roles of social forces such as education,peer pressure or group acceptance in dictating a person's consumption patterns?