Applied System Modeling: Exercises

This quiz applies the concepts of system modelling to practical scenarios. Topics include context models and scope creep, system boundary implications, activity diagrams for event planning, use cases, sequence diagrams, class diagrams, activity and sequence diagrams, state diagrams, and the limitations of automated model-to-code transformation

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Views #: 188

Questions #: 14

Time: 20 minutes

Pass Score: 80.0%

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Scope Creep and Context Models

1 pts

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Scope creep is a continuous increase in the scope of a project that can significantly increase project cost. How does producing a proper context model early in a project help prevent scope creep?

A context model explicitly defines what is inside the system boundary and what is outside, making it clear when proposed additions fall outside the agreed scope and should be treated as change requests rather than included by default

A context model shows the system's class hierarchy which prevents new classes from being added

A context model locks all requirements permanently and prevents any changes

A context model automatically generates a project schedule that prevents scope additions

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System Boundary and Project Complexity

2 pts

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The way in which a system boundary is defined can have serious implications on the complexity and cost of a project. Which of the following are valid examples of how boundary decisions affect complexity and cost? Select all that apply.

A system boundary that excludes all user interface concerns always reduces cost by making the system simpler

Positioning the boundary to include a difficult subsystem (rather than treating it as external) increases development complexity but may give the team more control

A boundary drawn to include patient personal data collection within the Mentcare system increases its scope and cost compared to relying on an external patient record system — but avoids slowness and dependency on the external system's availability

Deciding to include multiple user types with very different requirements within a single system boundary may require a configurable system rather than a simple fixed-function one, increasing complexity

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Activity Diagram for Event Planning — Correct Elements

2 pts

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You are asked to model the process of planning a large-scale party (booking a venue, organizing invitations, arranging catering, etc.) using a UML activity diagram that also shows the systems used at each stage. Which of the following elements should appear in the diagram? Select all that apply.

A filled circle representing the start of the planning process

Diamond decision nodes for conditional branches (e.g., [venue available] / [venue not available])

Class attribute sections showing the data stored by each activity

Rounded rectangles representing activities such as 'Book venue', 'Send invitations', 'Arrange catering'

«system» stereotyped boxes showing which software systems support each subprocess (e.g., a booking system, an email system)

Solid bars showing when concurrent activities can take place

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Use Cases for a Doctor in a Patient Management System

2 pts

2 pts

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Please drag and drop the options to sort them

You are modeling the data processing involved when a customer withdraws cash from a bank ATM using a UML activity diagram. Sort the following activities into the correct sequence.

ATM validates card and PIN with bank system

Customer selects withdrawal amount

System dispenses cash and debits account

System checks account balance

Customer takes cash and card; ATM prints receipt

Customer inserts card and enters PIN

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Activity vs. Sequence Diagram for ATM

1 pts

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For the ATM cash withdrawal scenario, both an activity diagram and a sequence diagram could be developed. Why might you want to develop both?

Because activity diagrams highlight the operations and data flows (intuitive for non-engineers), while sequence diagrams highlight the objects and messages between them (preferred by engineers) — together they give complementary views of the same process

Because an activity diagram shows the correct view and a sequence diagram is used to find errors in it

Because regulations require both types of diagram for all banking systems

Because the ATM is too complex to model with only one diagram type

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State Diagram for a DVD Player — Key States

2 pts

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You are asked to draw a state diagram for the control software of a DVD player. Which of the following are valid states for such a system? Select all that apply.

The user's hand pressing the play button

Playing (disc playing, display shows elapsed time)

Loading (disc being read and recognized)

Paused (playback frozen, display shows pause indicator)

Standby (no disc inserted, player waiting)

Menu (on-screen menu being navigated)

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State Diagram — Washing Machine Programs

1 pts

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A washing machine has different programs for different types of clothes (e.g., cotton, delicates, wool, quick wash). In a state diagram for its control software, how would you best handle this variation in programs?

Use only one state for all programs labeled 'Running'

Use a superstate called 'Washing' that encapsulates the common states (Fill, Wash, Rinse, Spin, Done), which is shared across programs, and use transitions into this superstate that set program-specific parameters (temperature, spin speed, duration)

Draw completely separate state diagrams for each program type with no shared states

Model the washing programs as classes in a class diagram instead of a state diagram

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State Diagram for a Mobile Camera — Key Stimuli

2 pts

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You are asked to model the state diagram for the camera control software on a mobile phone. Which of the following are valid stimuli (events that trigger state transitions) for such a system? Select all that apply.

Switching from photo mode to video mode

Shutter button fully pressed (triggers photo capture)

The battery level dropping below 10%

Shutter button half-pressed (triggers autofocus)

Pinch-to-zoom gesture on the screen

The size of the image sensor in megapixels

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Challenges in Automated Model-to-Code Translation

2 pts

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In principle, it is possible to generate working programs from a high-level model without manual intervention using model-driven architectures. Which of the following are genuine challenges that currently prevent completely automated translation? Select all that apply.

The execution environment includes more than just the standard platform — it includes company-specific application libraries and external services that are not captured in the standard off-the-shelf translators

UML is not expressive enough to describe any real system

Linking concepts used in different CIMs requires human understanding — e.g., mapping 'role' in a security model to 'staff member' in a hospital model cannot currently be automated

MDA tools are not commercially available

Special-purpose translators must sometimes be created for local environments, requiring tool development effort that reduces cost-effectiveness

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Scope Creep and Context Models

Correct Answer

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System Boundary and Project Complexity

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Activity Diagram for Event Planning — Correct Elements

Correct Answer

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Use Cases for a Doctor in a Patient Management System

Correct Answer

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Sequence Diagram for University Course Registration

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Sequence Diagram — Availability Check

Correct Answer

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Class Diagram for an Email System — Identifying Classes

Correct Answer

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Class Diagram for Email — Associations and Multiplicities

Correct Answer

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Activity Diagram for ATM Cash Withdrawal

Correct Answer

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Activity vs. Sequence Diagram for ATM

Correct Answer

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State Diagram for a DVD Player — Key States

Correct Answer

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State Diagram — Washing Machine Programs

Correct Answer

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State Diagram for a Mobile Camera — Key Stimuli

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Challenges in Automated Model-to-Code Translation

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