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Lecture 9: System Archi-3

K S Rajan

IIIT, Hyderabad

Components of the Architecture

System of Interest Architecture Architecture of Operating Environment

System Interfaces

Organization Roles, Missions and System

Applications

Problem, Opportunity and Solution Spaces

System Interaction with Operating

Environment

System Interfaces Objective 1: Physically link or bind two or more

system elements or entities.

Objective 2:Adapt one or more incompatiblesystem elements or entities.

Objective 3: Buffer the effects of incompatiblesystem elements.

Objective 4: Leverage human capabilities.

Objective 5: Restrain system element or itsusage.

InteroperabilityThe Ultimate InterfaceChallenge

Types of Interfaces Active Interfaces

Passive Interfaces

Combined Passive/Active Interfaces

Logical

Physical Mech, Elect, Optical, Acoustic, Natural,Chemical, Biological, etc

Access limited or otherwise

Caution: Engineers have a strong tendency to jump todefining thephysical interface BEFORE anyone hasdecided WHAT the interface is to accomplish.

Understanding Interfaces What Constitutes an Interface Failure?

Consequences of an Interface Failure

Interface Failures 1) disruption, 2) intrusion, 3) stress loading,

and 4)physical destruction.

Interface Vulnerabilities

Interface Latency

Interface Failure Mitigation andPrevention

Organization Roles, Missions and

System Applications

The Planning process

Strategic

Tactical

Frame of Reference or Terms of References

System Objectives and Mission Objectives

Contextual Roles

Mission system

Support system

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Mission Event Timeline

Problem, Opportunity and Solution

Spaces

Problem space and Opportunity Space

Risk mitigation; vulnerability assessment

Look at what you have products, services,

etc that can fit

Modify the products, if need

Ones Problem is Others Opportunity

Example: Saint-Gobains DryWall

Problem Space

Problem vs Symptom solving

Dynamics of the problem

Dynamic nature of the problem vs Static view

Forecasting of the Problem

Gap Problem

Establish Problem Space Boundaries Control, resources or spheres of influence

Partition the Problem Space

Solution Spaces Depends on the Boundary conditions

Clear, rigid vs. Fuzzy vs. Overlapping/Conflicting

Force Multipliers

Selecting Candidate solutions

Operating Environment

System Use Cases

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Attributes of Use Case

Unique identifier Objective (performance)

Outcome-based results

Assumptions Initial state

Final state

Environmental conditions

Preceding circumstances(optional)

Operating constraints

External inputs

Resources

Event-based timeline Frequency of occurrenceand utility priorities

Processing capabilities /response function

Scenarios andconsequences Probability of occurrence

Use case scenario actors

Stimuli and cues

Consequences

Compensating/mitigatingactions

UML Use Case Diagram

Use Case Sequence Diagram