(1) The diagrammatical and analytical methods by which the position of divided point of Ackerman steering linkage is properly determined put forward.

(2) The steps of diagrammatical method and approximation method for the optimization model are presented in details.

(3) At the same time, based on stable slope angle on water and underwater measured in field, we adopted diagrammatical method to predict the area.

(4) Design Structure Diagram. It is more structurized and more expressive, and reflects more deeply some fundamental principles of software engineering than other diagrammatical tools.

(5) The researches on Rosa Luxemburg's thought have undergone the diagrammatical transformation from "Return to Marx" to "Marxism" in 20th century.