The heading placed above multiple columns is called a masthead or _________ heading.

Using the state-based approach to modeling, as discussed in section 21.1.1, model the operation of an embedded software system for a voicemail system included in a landline phone. This should display the number of recorded messages on an LED display and should allow the user to dial-in and listen to the recorded messages.

What will be an ideal response?

____________________ is the process of observing portions of a system for problems or anomalies.

Fill in the blank(s) with the appropriate word(s).