When Drawing a Sequence Diagram, the Analyst Uses Lifelines and a Symbol

question 31

Essay

When drawing a sequence diagram, the analyst uses lifelines and a symbol to represent the execution occurrence. It is also possible for an object to be destroyed at some point in time. Explain these three concepts - what is a lifeline, what does the execution occurrence mean, and how it is possible that an object can be destroyed in a use case. Show the diagramming symbols used to represent each of these concepts.

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Definitions:

Rank Order

A rating scale providing a series of statements that the respondent is asked to place from highest to lowest based on his or her preferences.

Magnitude

The size, extent, or importance of something, often measured in terms of its scale, intensity, or impact.

Internal Consistency Reliability

A measure of how well the items on a test measure the same construct or concept, indicating the test's reliability.

Standard Score

A statistic that indicates how many standard deviations an element is from the mean in a normal distribution.