The first step in building a sequence diagram is to (points : 6) analyze the use case
identify which objects will participate
set the lifeline for each object
add the focus of control to each object's lifeline

Set the lifeline of each object

Explanation:

 The sequence diagram is the efficient way that use in the system requirement document for the system design.

The sequence diagram is useful in many system that shows the interaction of the logic between the each object in the system.

The first step for building the sequence diagram is that set the lifeline of the each object in the system and it allow the main specification in the run time scenarios in the graphical manner. Therefore, it enhance the performance of the system.

answer; ///the cm team

professionals can use many types of technology that can them. some examples are, computers (they research and can use for programs for data, they are also used for job applications, school work, and even to make new ideas), speedometers (can get data for unknown data), sometimes something as small as a pen (used for rough drafts, to insert data, and again job applications).