Such diagrams are often used for individual brainstorming and can be used in group brainstorming sessions as well. Influence diagrams follow the digraph convention by linking blobs or boxes. Like a systems map, it is a snapshot . It represents the main structural features of a situation and the important relationships that exist among them. This diagram is useful not only for understanding relationships but also as a precursor to restructuring them.
Arrows show that influence can or does flow in the direction indicated.
Use double-headed arrows only to show mutual, reciprocal influence of the same type, quality, and degree. Use two single-headed arrows pointing in opposite directions to denote influence of a different character, degree or kind between any two elements. Varying line width or intensity may be used to reflect stronger or weaker influence. It is possible to distinguish different types of influence if such distinctions are important and not self-evident. Do not overload the diagram with information.