Digital Modeling Training: Systems Viewpoint, Session 3

Digital Modeling Training

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Softw are Engineering Institute

Carnegie Mellon University

Pittsburgh, PA 15213

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Digital Modeling Training:

Systems Viewpoint

Session 3

7 Aug 2023

Nataliya Shevchenko

Digital Modeling Training

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Digital Modeling Training

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Digital Modeling Training Outline

Section 1: SysML Behavior Diagrams

Section 2: Systems Viewpoint Overview

Section 3: Demo in the model

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Digital Modeling Training

Section 1: SysML Behavior

Diagrams

Digital Modeling Training

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DoDAF/SysML/UML Behavior Diagrams Types

1. Use Case Diagram (not in DoDAF)

2. Activity Diagram

3. State Machine Diagram

4. Sequence Diagram

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SysML Use Case Diagram (not in DoDAF)

A Use Case Diagram describes the usage of a

system. The associations between actors and

use cases represent the communications that

occur between the actors and the subjects to

accomplish the functionalities associated with

the use cases. The subject of a use case can be

represented through a system boundary.

Use Cases can be used as a tool for elicitation

of requirements.

Source: https://docs.nomagic.com/display/SYSMLP190/SysML+Use+Case+Diagram

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SysML/UML Activity Diagram

The activity diagram describes control,

input, and output flows among actions.

It represents the system business and

operational workflows. It captures

actions and displays their results.

Though Activity diagrams are often

classified alongside interaction diagrams,

they actually focus on the flows driven

by internal processes (as opposed to

external events).

Source: https://docs.nomagic.com/display/SYSMLP190/SysML+Activity+Diagram

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UML State Machine Diagram

Source: https://www.visual-paradigm.com/guide/uml-unified-modeling-language/about-state-diagrams/

A State Machine is a behavior that

specifies the sequences of states an

object goes through during its

lifetime in response to events,

together with its responses to those

events.

State Machine Diagram consists of

states, transitions, events, and

activities. They are especially

important in modeling the behavior

of an interface, class, or

collaboration.

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UML Sequence Diagram

The Sequence diagram is a type of

Interaction diagram that focuses on

the Message interchange between

various Lifelines.

A Sequence diagram shows the

interaction information with an

emphasis on the time sequence.

The diagram has two dimensions: the

vertical axis represents time. And

the horizontal axis represents the

participating objects.

Source: https://docs.nomagic.com/display/MD190/Sequence+diagram, https://www.edrawmax.com/article/sequence-diagram-example.html

Digital Modeling Training

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Digital Modeling Training

Section 2: Systems Viewpoint

Overview

Digital Modeling Training

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Systems Viewpoint

“The DoDAF-described Models within the Systems Viewpoint describes systems and

interconnections providing for, or supporting, DoD functions.

DoD functions include both warfighting and business functions.

The Systems Models associate systems resources to the operational and capability

requirements.

These systems resources support the operational activities and facilitate the exchange of

information.

The Systems DoDAF-described Models are available for support of legacy systems.

As architectures are updated, they should transition from Systems to Services and utilize the

models within the Services Viewpoint.”

[DoDAF V2.0 Volume II]

Source: https://docs.nomagic.com/display/UPDM2P190SP4/Systems+viewpoint

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Process Guide

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Process Guide – Systems Viewpoint

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DoDAF to SysML Mapping

Source: “Model Based Systems Engineering and Systems Modeling Language”, DoDAFPlenary, January 5,2012

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SV-1 Systems Interface Description

The SV-1 addresses the composition and interaction of Systems.

For DoDAF V2.0, the SV-1 incorporates the human elements as types of Performers - Organizations and

Personnel Types.

The SV-1 links together the operational and systems architecture models by depicting how Resources are

structured and interact to realize the logical architecture specified in an OV-2 Operational Resource Flow

Description.

SV-1 can be represented using:

• SV-1 diagram is based on the UML Class diagram.

• SV-1 diagram is based on the UML Composite Structure diagram.

• UML Class diagram.

• UML Composite Structure Diagram.

• SysML Block Definition Diagram.

• SysML Internal Block diagram.

Source: https://docs.nomagic.com/display/UPDM2P190SP4/SV-1+Systems+Interface+Description

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SV-1 Diagram

Source: https://docs.nomagic.com/display/UPDM2P190SP4/SV-1+Systems+Interface+Description

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SV-2 Systems Resource Flow Description

SV-2 specifies the System Resource Flows between Systems and may also list the

protocol stacks used in connections.

SV-2 DoDAF-described Model is used to give a precise specification of a connection

between Systems. This may be an existing connection or a specification for a connection

that is to be made.

SV-2 can be represented using:

• SV-2 diagram is based on the UML Class diagram.

• SV-2 diagram is based on the UML Composite Structure diagram.

• UML Class Diagram.

• UML Composite Structure Diagram.

• SysML Block Definition Diagram.

• SysML Internal Block Diagram.

Source: https://docs.nomagic.com/display/UPDM2P190SP4/SV-2+Systems+Internal+Resource+Flow+Description

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SV-2 Diagram

Source: https://docs.nomagic.com/display/UPDM2P190SP4/SV-2+Systems+Internal+Resource+Flow+Description

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SV-3 Systems-Systems Matrix

SV-3 enables a quick overview of all the system resource interactions specified in one or

more SV-1 Systems Interface Description models.

Source: https://docs.nomagic.com/display/UPDM2P190SP4/SV-3+Systems-Systems+Matrix

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SV-4 Systems Function Description

The SV-4 addresses human and system functionality.

A SV-4 diagram for System Function hierarchies. This diagram is based on the UML Class

diagram.

Source: https://docs.nomagic.com/display/UPDM2P190SP4/SV-4+Systems+Functionality+Description

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SV-4 Systems Function Flow Description

An SV-4 diagram for System Function flows. This diagram is based on the UML Activity

diagram.

Source: https://docs.nomagic.com/display/UPDM2P190SP4/SV-4+Systems+Functionality+Description

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SV-10b Systems State Transition Description

The SV-10b is a graphical method of describing a

resource (or system function) response to various

events by changing its state.

The diagram basically represents the sets of

events to which the resources in the Activities

respond (by taking an action to move to a new

state) as a function of its current state.

Each transition specifies an event and an action.

SV-10b can be represented using a UML State

Machine diagram.

Source: https://docs.nomagic.com/display/UPDM2P190SP4/SV-10b+Systems+State+Transition+Description

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SV-10c Systems Event-Based Description

The SV-10c provides a time-

ordered examination of the

interactions between functional

resources.

Each event-trace diagram should

have an accompanying

description that defines the

particular scenario or situation.

SV-10c can be represented using a

UML Sequence Diagram.

Source: https://docs.nomagic.com/display/UPDM2P190SP4/SV-10c+Systems+Event-Trace+Description

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Requirements Traceability

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Block Interactions

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Behavior Allocation

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Digital Modeling Training

Section 3: Demo in the model

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