$2\mathrm{.}1$ What are the most important ideas, keywords, and phrases that are stated in the definition of a system?

$2\mathrm{.}2$ Explain the relationships among the following words: system, environment, boundary, and interface.

$2\mathrm{.}3$ Explain the following statement about systems: "Decomposition is inherently hierarchical"

$2\mathrm{.}4$ Explain what is meant by the architecture of a system.

$2\mathrm{.}5$ What does the top$-$down approach allow a system architect to do that might be more difficult otherwise?

$2\mathrm{.}6$ What is the primary concern of application architecture? Give an example of application architecture, either your own, or one from the examples in the book Explain how this example fulfills the features and requirements of the concept of application architecture.