Beginners Guide to Model-Based Systems Engineering

12/18/2018

Key Semantics of Sequence Diagrams, cont.

• Interaction operators • Lightweight (and incomplete) representation of structure enclosing functions and nested operators • Par – parallel • Alt – exclusive or • Loop • Messages • Items sent and received between interacting entities • Represented as lines with arrowhead for direction of flow

Additional information available in Chapter 10 of A Practical Guide to SysML

101

sd_PerformSystemContext Functions

Customers

GeospatialLibrary

CertificationAuthority

Collectors

Mapping Sequence Diagrams

par

_PerformCustomers Functions

_PerformGeospatialLibrary Functions

_PerformCertificationValidationFunctions

customer certification responses

customer certification responses

requests

_PerformCollectors Functions

customer certification requests

products

data

tasking

elicits

Requirement

status

Use Case

data

elaboratedby

requests

refinedby

basedon / specifiedby

verifiedby

specifiedby

includes/ extends/ kindof

Verification Requirement

verifiedby

fulfilledby

involves/ describes

executedby

Verification Event

Resource

employs

includes

Test Configuration

Test Activity

captures/ consumes/ produces

Level of Detail: Medium Audience: General

formedby

Test Procedure

decomposedby

Component

Function

performs

Content: Specification of sequence (but not control), allocation, and triggering Use: Initial capture of threads when focusing purely on triggering aspects; communication with software engineers

incorporates

exhibits

exitsby

built from / kindof

exposes

decomposedby

joined to

State

enters

exitedby

inputs/ outputs/ triggeredby

Exit

Interface

Port

decomposedby

includes

comprisedof

Event

Transition

responsible for

connectsto

triggeredby

Link

Item

transfers

includes

decomposedby

constrains/ usesparameter from

generates

results in

causes

assignedto

Organization

Constraint Definition

Concern

Risk

RevisionDate:1August2018

102

51