Beginners Guide to Model-Based Systems Engineering

12/18/2018

Mapping N2 (“N-squared”) Diagrams

elicits

Requirement

Use Case

elaboratedby

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

formedby

Test Procedure

decomposedby

Component

Function

performs

incorporates

exhibits

exitsby

built from / kindof

exposes

decomposedby

Level of Detail: Low Audience: General Content: Data flow with possible inclusion of allocation Use: Understanding of data flow and implied interfaces; clustering analysis

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

105

Enhanced Function Flow Block Diagrams (EFFBDs)

• Represent the full specification of system behavior • Control flow • Data flow • Resources • Allocation • Structured equivalent to (and source of) SysML activity diagram • Best suited when dealing with broader audiences

106

53