• IEEE 610 
• The relationship between two or more objects in the development process 
• The degree of interaction of one element with another 
• Source and reason for creating the component

The analysis of real case with using a diagrams as the main method of communication of requirements elicitation. Author's speech is about particular qualities of business analyst who engages in autodmen. The methods of interaction will be considered and presented based on existing experience. The author will present the most effective ways of gathering requirements in the auto-domain environment. We will discuss a positive scenario of step-by-step instructions of preparing a documentations.