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C4ISR architectures and software architectures
1. C4ISR Architectures and
Software Architectures
Rich Hilliard
rh@mitre.org
IEEE Architecture Working Group
http://www.pithecanthropus.com/~awg/
Circa 1996?
updated info:
r.hilliard@computer.org
http://www.iso-architecture.org/42010
2. Contents
“Architecture” in Context
What is the C4ISR Architecture Framework?
Issues with the Framework
How to fix it?
How does it relate to “Software Architecture”?
4. Two Definitions We Like
An architecture is the highest level (essential, unifying)
concept of a system in its environment
– IEEE Architecture Working Group, 1995
The structure of the components of a program/system, their
interrelationships, and principles and guidelines governing
their design and evolution over time.
SEI, 1995
5. What is the Framework?
The Command, Control, Communications, Computers,
Intelligence, Surveillance, and Reconnaissance (C4ISR)
Architecture Framework
– “... provides the rules, guidance, and product
descriptions for developing and presenting architecture
descriptions that ensure a common denominator for
understanding, comparing and integrating
architectures.”
– OSD recently directed “that all on-going and, planned
C4ISR or related architectures be developed in
accordance with Version 2.0”
6. What is the Framework?
“There are three major perspectives, i.e., views, that
logically combine to describe an architecture ... the
operational, systems and technical views.”
All Framework quotations and examples in this briefing
are taken from Framework 2.0 document (available from
http://www.cisa.osd.mil)
7. What is the Framework?
Operational
View
Identifies Warfighter
Relationships and Information Needs
l
Pro
qui tion oda
ces
Re rma r-N
s
sin
ent
nge nfo Inte
ga
rem
nd
cha f I nd
Le
Ex els o ing a
vel
Levocess
so
itie ns
atio
f
s,
Pr
s, A oci
ctiv
ode Ass
to N tems
Sys
Specific Capabilities
Systems Identified to Satisfy Technical
View Information-Exchange View
Levels and Other
Operational Requirements
Relates Capabilities and Characteristics Prescribes Standards and
to Operational Requirements Technical Criteria Governing Conventions
Interoperable Implementation/
Procurement of the Selected
System Capabilities
8. What is the Framework?
(Operational Architecture View)
“The operational architecture view is a description of the
tasks and activities, operational elements, and information
flows required to accomplish or support a military
operation.”
Key concepts:
– operational elements, activities and tasks, information
exchange requirements
9. What is the Framework?
(Systems Architecture View)
“The systems architecture view is a description, including
graphics, of systems and interconnections providing for, or
supporting, warfighting functions.”
Key concepts:
– systems, nodes, locations, physical connections,
performance parameters
10. What is the Framework?
(Technical Architecture View)
“The technical architecture view is the minimal set of rules
governing the arrangement, interaction, and
interdependence of system parts or elements, whose
purpose is to ensure that a conformant system satisfies a
specified set of requirements.”
Key concepts:
– implementation guidelines, technical standards,
conventions, rules and criteria organized into profiles
11. What is the Framework?
Applicable Essential
Architecture Product Architecture or General Nature
Reference Product
View Supporting
All Views Overview and Summary Scope, purpose, intended users, environment depicted,analytical
(Context) AV-1 Essential findings, if applicable
Information (4.2.1.1)
The Framework identifies 26 All Views
(Terms)
AV-2 Integrated Dictionary Essential Definitions of all terms used in all products
(4.2.1.2)
High-level Operational High-level graphical description of operational concept (high-level
architecture products Operational
Operational
OV-1
OV-2
Concept Graphic
Operational Node
Connectivity Description
Essential
Essential
organizations, missions, geographic configuration, connectivity, etc.)
Operational nodes, activities performed at each node,
connectivities & information flow between nodes
(4.2.1.3)
(4.2.1.4)
Operational Information Information exchanged between nodes and the relevant attributes of
Operational OV-3 Essential that exchange such as media, quality, quantity, and the level of
7 essential (i.e., required)
Exchange Matrix (4.2.1.5)
Operational OV-4 Command Relationships
Chart
interoperability required.
Supporting Command, control, coordination relationships among organizations
(4.2.2.1)
Activities, relationships among activities, I/Os, constraints (e.g., policy,
Operational OV-5 Activity Model Supporting guidance), and mechanisms that perform those activities. In addition to
19 supporting (i.e., optional)
showing mechanisms, overlays can show other pertinent information. (4.2.2.2)
Operational OV-6a Operational Rules Model Supporting One of the three products used to describe operational activity sequence and
timing that identifies the business rules that constrain the operation (4.2.2.3.1)
Operational OV-6b Operational State Transition Supporting One of the three products used to describe operational activity sequence and
Description timing that identifies responses of a business process to events (4.2.2.3.2)
Operational Event/Trace Supporting One of the three products used to describe operational activity sequence and
Operational OV-6c Description timing that traces the actions in a scenario or critical sequence of events
(4.2.2.3.3)
Documentation of the data requirements and structural business
Operational OV-7 Logical Data Model Supporting
process rules of the Operational View. (4.2.2.4)
SV-1 System Interface Essential Identification of systems and system components and their
Systems Description interfaces, within and between nodes (4.2.1.6)
Systems Systems Communications
SV-2 Description Supporting Physical nodes and their related communications laydowns
(4.2.2.5)
Relationships among systems in a given architecture; can be designed to show
Systems SV-3 Systems 2 Matrix Supporting relationships of interest, e.g., system-type interfaces, planned vs.
existing interfaces, etc. (4.2.2.6)
Systems Functionality Functions performed by systems and the information flow among
Systems
Systems SV-4 Supporting
Description system functions (4.2.2.7)
Operational Activity to System Mapping of system functions back to operational activities
Systems SV-5 Function Traceability Matrix Supporting (4.2.2.8)
System Information Detailing of information exchanges among system elements,
Systems SV-6 Supporting applications and H/W allocated to system elements
Exchange Matrix (4.2.2.9)
System Performance Performance characteristics of each system(s) hardware and software
Systems SV-7 Parameters Matrix Supporting elements, for the appropriate timeframe(s) (4.2.2.10)
Planned incremental steps toward migrating a suite of systems to a more
System Evolution
Systems SV-8 Supporting efficient suite, or toward evolving a current system to a future
Description implementation (4.2.2.11)
Systems SV-9 System Technology Supporting Emerging technologies and software/hardware products that are expected to
Forecast be available in a given set of timeframes, and that will affect future
development of the architecture (4.2.2.12)
Systems SV-10a Systems Rules Model Supporting One of three products used to describe systems activity sequence and
timing -- Constraints that are imposed on systems functionality due to
some aspect of systems design or implementation (4.2.2.13.1)
Systems SV- 10b Systems State Transition Supporting One of three products used to describe systems activity
Description sequence and timing -- Responses of a system to events (4.2.2.13.2)
Systems Event/Trace One of three products used to describe systems activity sequence and
Systems SV -10c Description Supporting timing -- System-specific refinements of critical sequences of events
described in the operational view (4.2.2.13.3)
Systems SV-11 Physical Data Model Supporting Physical implementation of the information of the Logical Data
Model, e.g., message formats, file structures, physical schema (4.2.2.14)
Technical Architecture
Technical TV-1 Essential Extraction of standards that apply to the given architecture
Profile
(4.2.1.7)
Standards Technology Supporting Description of emerging standards that are expected to apply to the
Technical TV-2 Forecast given architecture, within an appropriate set of timeframes (4.2.2.15)
12. Issues with the Framework
Do we need another MIL Standard?
– in the face of recent DOD direction to use best
commercial practices (such as IEEE, ISO, and de facto
industry standards like UML)
– Its products are summary in nature rather than
“developmental”
– against trend toward contractor-defined products
– “... the Framework does not provide guidance in how to
design or implement a specific architecture or how to
develop and acquire systems-of-systems.”
13. Issues with the Framework
What does it mean to conform to the Framework?
– Produce all essential, applicable products
No provisions in Framework for user comment, document
revision and maintenance
The authors haven’t done their homework
– The Framework ignores the substantial literature and
emerging practice in architecture from the commercial
world, industrial, research and standards communities
– Mistakenly cites a definition of “architecture” as from
IEEE (actually the definition appears to be from SEI)
14. Issues with the Framework
(Conceptually)
Everything isn’t an architecture. As Mary Shaw put it:
– “Let’s not dilute the term architecture by applying it to
everything in sight” (April 1995)
– “Architecture” as used in the Framework is
synonymous with “model”
Does not distinguish problem and solution space
orientations
Systems Architecture View adopts a stove-piped mind set
Operational-Systems-Technical split cuts across usual
engineering partitions
15. How to fix it?
Change the name to C4ISR Modeling Framework
Make the notion of view more rigorous, following
community practices (ISO, IEEE)
Generalize “operational architecture view” to address
multiple stakeholders of a DOD (or any system)
Eliminate redundant architecture products, and allow best
commercial practices in selection of notations and tools,
managing at the viewpoint level
16. How does the Framework relate to
Software Architecture?
Software architecture “defines [a] system in terms of
computational components and interactions among those
components” (Shaw and Garlan)
Key elements: components (clients, servers, databases,
filters, layers, ...); connectors (procedure calls, shared
variables, protocols, ...)
17. Issues with “Software Architecture”
Emphasis on software structure makes it difficult to deal
with other system fundamentals, e.g.,
– Distribution
– Security
– Behavior and dynamics
18. IEEE Architecture Working Group:
Goals and Objectives
Take a “wide scope” interpretation of architecture as
applicable to software-intensive systems
Establish a conceptual framework and vocabulary for
talking about architectural issues of systems
Identify and promulgate sound architectural practices
Allow for the evolution of those practices as relevant
technologies mature
19. Conceptual Framework
Architecture Architectural Description
documents
has an conforms to
System
influences
fits with lives in * fulfills solves
has concerns for
Context Mission
achieved within
participate in have role in
* has
System Stakeholder
Architectural Description
comprises
Viewpoint Architectural View
satisfies
comprises
Model
represents concerns of
System Stakeholder
20. Example Architecture Viewpoints
Capability View
Distribution View Production View
Architecture
(set of abstractions)
Data View Security View
Communications View
21. Current Status and Plans
Version 1.0 of P1471 Recommended Practice, has
circulated to reviewers
First ballot of P1471, October 1998
Interested reviewers/participants contact:
– Basil Sherlund (chair) b.sherlund@computer.org, or
– ieee-awg@spectre.mitre.org
– http://www.pithecanthropus.com/~awg