MODAF Framework: 7 Viewpoints, 47 Views and What Replaced It

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MODAF Framework

MODAF (the Ministry of Defence Architecture Framework) is the UK Ministry of Defence’s enterprise architecture framework for planning defense capability, first released in August 2005 and last revised as version 1.2.004 in May 2010. The MOD withdrew it on 15 January 2021 and replaced it with the NATO Architecture Framework version 4 (NAF v4), whose current edition, NAF v4.1, was published in March 2026.

This guide is built from the MOD’s own MODAF documentation, which is still downloadable from GOV.UK: the seven viewpoints, all 47 views, the six-step architecting process the MOD published, how MODAF differed from DoDAF, and a view-by-view map to NAF v4.1 for anyone converting a legacy MODAF model.

MODAF at a glanceDetail
Full nameMinistry of Defence Architecture Framework (MOD Architecture Framework)
OwnerUK Ministry of Defence
Derived fromUS Department of Defense Architecture Framework (DoDAF) version 1.0
First releaseMODAF 1.0, August 2005
Final releaseMODAF 1.2.004, May 2010
Structure7 viewpoints, 47 views
Meta-modelM3 (MODAF Meta Model), later MODEM, built on the IDEAS foundation model
StatusWithdrawn by the MOD on 15 January 2021
Replaced byNATO Architecture Framework version 4 (NAF v4); current edition NAF v4.1, March 2026

What is MODAF?

MODAF is a set of standard views that describe a defense enterprise from several angles: the capabilities it needs, how it operates, which services and systems deliver those capabilities, which standards apply and which projects will deliver the change. The MOD’s own definition, from its MODAF guidance:

MODAF provides a coherent set of rules and templates, known as ‘views’, that, when populated, provide a graphical and textual visualisation of the business area being investigated.

UK Ministry of Defence, MOD Architecture Framework guidance (GOV.UK)

Each view is a snapshot of one shared model, not a standalone drawing. The MODAF Meta Model (M3) defines how the data in every view relates, so an operational node shown in OV-2 is the same node that owns a swimlane in OV-5, and a model built in one tool can be exchanged with another. The MOD’s stated goal was that MODAF tools be “model driven”.

The MOD developed MODAF from DoDAF version 1.0, then extended and modified it to meet MOD requirements. By the MOD’s own account, MODAF was also used by industry partners including BAE Systems, Thales, Lockheed Martin, Boeing and Serco, by GCHQ and National Air Traffic Services, and was adopted by the Swedish armed forces.

Is MODAF still used in 2026?

Not for new work. On 15 January 2021 the MOD marked its MODAF guidance on GOV.UK as withdrawn, with a one-line notice:

MODAF has been replaced with the NATO Architecture Framework (NAF) V4.

Withdrawal notice, MOD Architecture Framework page, GOV.UK, 15 January 2021

The documents were withdrawn, not deleted. The full MODAF 1.2.004 set (the viewpoint guides, the M3 and MODEM meta-models, the view summary and the FAQs) can still be downloaded from the withdrawn GOV.UK page, which matters if you inherit a MODAF model built before the switch.

NAF v4 has itself moved on. NATO’s Architecture Capability Team published NAF v4.1 (document version 2026.03) in March 2026. It renamed several viewpoints, for example L2 Logical Scenario became Logical Structure and P1 Resource Types became Resource Taxonomy, and it states that NAF v4 compliant architectures can be built with The Open Group’s ArchiMate or the Object Management Group’s Unified Architecture Framework (UAF) Domain Meta-model. OMG published UAF 1.3 as a formal specification in April 2026.

MODAF version history

MODAF went through four releases in five years and then stayed frozen at 1.2.004 for more than a decade before its withdrawal.

DateRelease or eventWhat changed
August 2005MODAF 1.0First release, developed from DoDAF 1.0
April 2007MODAF 1.1Changes from a review of the views inherited from DoDAF
April 2008MODAF 1.2 (1.2.003)Service Oriented Views added, making seven viewpoints; services used in OV-2, OV-5 and OV-6c; software added as a resource type
May 2010MODAF 1.2.004Final release: new view SV-12b Service Composition, with the old SV-12 renamed SV-12a, for 47 views in total
December 2012GOV.UK guidanceMOD publishes its MODAF guidance and documents on GOV.UK
15 January 2021WithdrawnGuidance withdrawn; MODAF replaced with NAF v4
March 2026NAF v4.1Current edition of the successor framework

Sources: the MOD’s 1.2.004 download, 1.2 version history and 1.2.004 change log; withdrawal date from GOV.UK.

The 7 MODAF viewpoints

MODAF groups its 47 views into seven viewpoints. Each viewpoint serves a different stakeholder, so a capability planner, an acquisition manager and a systems engineer can each read the part of the architecture that concerns them.

MODAF Framework
MODAF’s six viewpoints as they stood before version 1.2. The April 2008 release added a seventh, Service Oriented Views (SOV), listed in the table below.
ViewpointCodeViewsWhat it describes (MOD’s definition)
All ViewsAV2A description and glossary of the architecture: scope, ownership, timeframe and the metadata needed to search and query it
Strategic ViewsStV6The desired business outcome and the capabilities required to achieve it
Operational ViewsOV11The processes, information and entities needed to fulfil the capability requirements, in abstract rather than physical terms
Service Oriented ViewsSOV7The services (units of work supplied by providers to consumers) required to support the operational processes
Systems ViewsSV17The physical implementation of the operational and service views, which defines the solution
Technical Standards ViewsTV2The standards, rules, policy and guidance that apply to the solution
Acquisition ViewsAcV2The dependencies and timelines of the projects that will deliver the solution

Two of these viewpoints were the MOD’s answer to gaps in DoDAF 1.0: Strategic Views for capability managers and Acquisition Views for acquisition managers. The Service Oriented Viewpoint came later, in version 1.2, and the MOD’s framework comparison names NATO’s NAF as the source of the views added in that release.

All 47 MODAF views (version 1.2.004)

MODAF 1.2.004 defines 47 views: 2 All Views, 6 Strategic, 11 Operational, 7 Service Oriented, 17 Systems, 2 Technical Standards and 2 Acquisition. The names below are taken from the MOD’s 1.2.004 documentation, and the category column from the MOD’s 2009 view summary, which sorted every view by the kind of artifact it produces.

ViewNameCategory
AV-1Overview & Summary InformationTabular
AV-2Integrated DictionaryOntology
StV-1Enterprise VisionTabular
StV-2Capability TaxonomyOntology
StV-3Capability PhasingMapping
StV-4Capability DependenciesStructural
StV-5Capability to Organisation Deployment MappingMapping
StV-6Operational Activity to Capability MappingMapping
OV-1aHigh-Level Operational Concept GraphicPictorial
OV-1bOperational Concept DescriptionTabular
OV-1cOperational Performance AttributesTabular
OV-2Operational Node Relationship DescriptionStructural
OV-3Operational Information Exchange MatrixTabular
OV-4Organisational Relationships ChartStructural
OV-5Operational Activity ModelBehavioural
OV-6aOperational Rules ModelBehavioural
OV-6bOperational State Transition DescriptionBehavioural
OV-6cOperational Event-Trace DescriptionBehavioural
OV-7Information ModelStructural
SOV-1Service TaxonomyOntology
SOV-2Service Interface SpecificationTabular
SOV-3Capability to Service MappingMapping
SOV-4aService ConstraintsBehavioural
SOV-4bService State ModelBehavioural
SOV-4cService Interaction SpecificationBehavioural
SOV-5Service FunctionalityBehavioural
SV-1Resource Interaction SpecificationStructural
SV-2aSystem Port SpecificationStructural
SV-2bSystem to System Port Connectivity DescriptionStructural
SV-2cSystem Connectivity ClustersStructural
SV-3Resource Interaction MatrixMapping
SV-4Functionality DescriptionBehavioural
SV-5Function to Operational Activity / Service Function TraceabilityMapping
SV-6Systems Data Exchange MatrixTabular
SV-7Resource Performance Parameters MatrixTabular
SV-8Capability Configuration ManagementTimeline
SV-9Technology & Skills ForecastTabular
SV-10aResource Constraints SpecificationBehavioural
SV-10bResource State Transition DescriptionBehavioural
SV-10cResource Event-Trace DescriptionBehavioural
SV-11Physical SchemaStructural
SV-12aService ProvisionMapping (listed as SV-12 in 2009)
SV-12bService CompositionNot in the 2009 grid (added 2010)
TV-1Standards ProfileTabular
TV-2Standards ForecastTabular
AcV-1Acquisition ClustersStructural
AcV-2Programme TimelinesTimeline

OV-7 and SV-11 are MODAF’s two data models: the logical information model and the physical schema. If those terms are new, our guide to enterprise data modeling covers the difference.

The seven view categories

The categories cut across the viewpoints: a viewpoint says what a view is about, and a category says what kind of artifact it is. The MOD’s view summary defines them as follows.

  • Tabular (11 views): views that are essentially tables, including structured text.
  • Structural (10): diagrams of the structural aspects of an architecture.
  • Behavioural (12): diagrams of its behavioral aspects.
  • Mapping (7): matrix or similar mappings between two different types of information.
  • Ontology (3): views that extend the MODAF ontology for a particular architecture.
  • Pictorial (1): exactly one view, OV-1a, which is essentially a free-form picture.
  • Timeline (2): diagrams of the programmatic aspects of an architecture.

Do you need all 47 views?

No. The MOD was explicit that a team populates only the views relevant to its question, and that most communities would only ever work with a subset:

Indeed, each group of users within the MOD will have different needs and will only populate and exploit those MODAF Views that are of relevance to them.

UK Ministry of Defence, MOD Architecture Framework guidance (GOV.UK)

The MODAF architecting process: 6 steps

The MOD published a six-step example process for building a MODAF architecture in The MODAF Architecting Process (February 2009). It presented the steps as one workable approach, not a mandatory method:

However, the MOD does not prescribe a “MODAF Method” for architecting and creating MODAF views. What this document presents is an example of one approach to take; there are many different ways to approach the architecting process.

UK Ministry of Defence, The MODAF Architecting Process, 2009
Infographics for Steps of MODAF Process
The six steps of the MOD’s example MODAF architecting process (MOD, February 2009).
  1. Establish intended use. Agree the questions the architecture must answer, which the MOD calls “exam questions”, often in a workshop with all the stakeholders who will supply or use its data. The MOD’s examples include finding capability gaps and overlaps, trading off capability options and fixing system boundaries and interfaces.
  2. Define architecture scope. Bound the architecture by process, organization, systems, geography, Defence Lines of Development, timeframe (as-is or to-be) and level of detail; list the views you expect to produce; and tell MODAF governance, so existing architectures can be found and reused.
  3. Develop data requirements. Write a data-gathering plan (what data, at what granularity, from which sources), assess the security classification, including the risk that combined data is more sensitive than its parts, and choose a tool, checking that it supports the M3.
  4. Capture architecture. Build the model strictly to the M3 and the MODAF taxonomy, have subject matter experts review it, complete AV-1 and AV-2, and publish the baseline to the repository.
  5. Conduct analyses. Run the analyses defined in step 1, for example a static gap and overlap analysis against the Strategic Views, or a dynamic network bandwidth analysis using SV-1 configurations and OV-2 and OV-3 traffic data.
  6. Document results. Feed the findings back into the architecture, review it again and publish the finalized version.

The MOD also described shortcuts. When an architecture largely exists already, steps 1 to 3 can be done in a single quick pass, and read-only users such as assurance teams follow an abbreviated version with no update or publication. The six-step shape outlived MODAF: NAF v4.1 states that its own method is compliant with the six-step architecting process introduced by DoDAF.

What MODAF was designed to achieve

MODAF was designed to make defense architectures consistent, governed, reusable, shareable and adaptable to the question at hand. The MOD never published these as a numbered list of principles, but each one is stated in its own documents.

Core Principles of  MODAF
Five design aims of MODAF. The table traces each one to the MOD document that states it.
AimWhat the MOD’s documentation saysSource
StandardizationA common set of rules and templates (the views), underpinned by one meta-model, the M3, which is also the standard for exchanging architecture data between modeling toolsMODAF guidance
GovernanceMajor revisions (adding or removing views or viewpoints, renaming a viewpoint, changing the meta-model approach) needed MODAF Steering Group approval; new architectures were to be registered with MODAF governance and published to a repositoryVersion history; Architecting process
ReusabilityCapabilities defined in the Strategic Views are expected to be reused across a number of architectures, and repositories were meant to let teams copy whole elements from existing modelsMODAF guidance; Architecting process
CollaborationSharing architecture information to find gaps and overlaps between operating processes and the systems that support them, across the MOD, industry and alliesMODAF guidance; Framework comparison
FlexibilityEach team populates only the views relevant to it, and the MOD prescribed no single methodMODAF guidance; Architecting process

MODAF vs DoDAF: what the MOD changed

MODAF started from DoDAF 1.0 and diverged where the MOD needed to model capability, incremental acquisition and physical flows. The MOD’s own comparison with other frameworks lists the differences and adds that they were not peculiar to Britain:

None of these factors are believed to be specific to the UK procurement regime or UK defence architecture requirements.

UK Ministry of Defence, Comparison of MODAF with other frameworks, 2009
AreaDoDAF 1.0MODAF
Capability planningNo dedicated viewpoint; architectures framed as as-is and to-beStrategic Viewpoint for capability managers: capability taxonomy, phasing and dependencies
Projects and programsTreated as out of scope; evolution shown through SV-8, SV-9 and TV-2Acquisition Viewpoint linking projects to the capabilities they deliver and to each other
Flows between nodesNeedlines carry information exchangesNode connections also carry flows of energy, materiel and people
NodesOperational nodes plus separate System NodesOperational nodes are strictly logical; what DoDAF calls System Nodes become Physical Assets in the M3
OrganizationsA single Organization conceptSeparates organizations from posts, and actual organizations from organization types

For DoDAF’s structure today, see our DoDAF guide; for how DoDAF, MODAF, TOGAF, Zachman and UAF fit together, see enterprise architecture frameworks compared.

How MODAF maps to the Zachman Framework

The MOD mapped each MODAF viewpoint to a row of the Zachman Framework. Most MODAF viewpoints land in the top two rows, because MODAF is about planning and specifying capability rather than implementation technology.

MODAF viewpointZachman rowThe MOD’s reasoning
Strategic (StV)Scope / PlannerEnterprise planning
Operational (OV)Business Model / OwnerThe business at any one time
Systems (SV)System Model / DesignerCapability specification: designing and assembling capability configurations
Technical Standards (TV)Scope / PlannerStandards for the enterprise as a whole, not implementation technology
Acquisition (AcV-2)Scope / PlannerA closer look at the enterprise planning process
StV-6 and SV-5Between rowsBoth are mappings between layers

MODAF to NAF v4.1: where each viewpoint went

Each MODAF viewpoint has a home in the NAF v4.1 grid, which arranges viewpoints in five rows (Concepts, Service, Logical, Physical Resource and Architecture Foundation) and columns for taxonomy, structure, connectivity, behavior, information, constraints and roadmap. NATO publishes the mapping from its older NAF v3 views at row level (NAF v4.1, Table 3-24), and the MOD says MODAF was the template for NAF v3.

MODAF viewpointNAF v3 viewNAF v4.1 rowBasis
Strategic (StV)Capability (NCV)Concepts (C)NATO Table 3-24
Service Oriented (SOV)Service-Oriented (NSOV)Service (S)NATO Table 3-24
Operational (OV)Operational (NOV)Logical (L)NATO Table 3-24
Systems (SV)Systems (NSV)Physical Resource (P)NATO Table 3-24
All Views (AV)All Views (NAV)Architecture Foundation (A)NATO Table 3-24
Technical Standards (TV)Not in NATO’s tableA8 Architecture StandardsOur reading of the A8 purpose statement
Acquisition (AcV)Not in NATO’s tableRoadmap column, chiefly Lr Logical RoadmapOur reading of the Lr purpose statement

The NAF v3 column is NATO’s; the step from MODAF to NAF v3 is ours, based on matching view names. The MOD’s own 1.2.004 documentation names NAF v3 equivalents for its service views, for example SOV-1 to NSOV-1 and SOV-3 to NCV-7.

View-level crosswalk for converting a MODAF model

For a migration, the row is not enough; you need to know where each view goes. The table below pairs MODAF views with the NAF v4.1 viewpoint whose name or purpose statement matches. It is our mapping, prepared from the two documents’ own definitions, and NATO does not publish one at this level.

MODAF viewClosest NAF v4.1 viewpointWhy they match
StV-1 Enterprise VisionC2 Enterprise VisionSame name; strategic context for the capabilities
StV-2 Capability TaxonomyC1 Capability TaxonomySame name; capabilities organized into taxonomies
StV-3 Capability PhasingCr Capability RoadmapBoth tie capabilities to capability increments over time
StV-4 Capability DependenciesC3 Capability DependenciesSame name
SOV-1 Service TaxonomyS1 Service TaxonomySame name
SOV-2 Service Interface SpecificationS3 Service InterfacesInterfaces of a service
SOV-3 Capability to Service MappingC1-S1 Service to Capability MappingSame mapping; the MOD lists NCV-7 as its NAF v3 equivalent
SOV-4a Service ConstraintsS8 Service ConstraintsSame name since NAF v4.1
SOV-4b Service State ModelS5 Service StatesStates of a service and transitions between them
SOV-4c Service Interaction SpecificationS6 Service SequenceNAF called S6 Service Interactions until v4.1
SOV-5 Service FunctionalityS4 Service FunctionsFunctions a service provides
OV-2 Operational Node Relationship DescriptionL2 Logical StructureNodes and the Needlines between them
OV-5 Operational Activity ModelL4 Logical ActivitiesActivities of the logical layer
OV-6a Operational Rules ModelL8 Logical ConstraintsRules and constraints on the logical layer
OV-6b Operational State Transition DescriptionL5 Logical StatesStates of a node and transitions between them
OV-6c Operational Event-Trace DescriptionL6 Logical SequenceTime-ordered sequence of activities and flows
OV-7 Information ModelL7 Information ModelSame name
SV-1 Resource Interaction SpecificationP3 Resource InteractionsInteractions between active resources
SV-4 Functionality DescriptionP4 Resource FunctionsFunctions carried out by resources
SV-5 Function to Operational Activity / Service Function TraceabilityL4-P4 Activity to Function MappingLinks resource functions to operational activities and service functions
SV-8 Capability Configuration ManagementPr Resource RoadmapNAF called Pr Configuration Management until v4.1
SV-10a Resource Constraints SpecificationP8 Resource ConstraintsConstraints and requirements on resources
SV-10b Resource State Transition DescriptionP5 Resource StatesResource states in response to events
SV-10c Resource Event-Trace DescriptionP6 Resource SequenceChronological sequence of resource interactions
SV-11 Physical SchemaP7 Data ModelData entities and their relationships
TV-1 Standards Profile and TV-2 Standards ForecastA8 Architecture StandardsStandards, rules, policy and guidance, including forecasts of change
AcV-2 Programme TimelinesLr Logical RoadmapAcquisition planning and project dependencies

The remaining views, such as AV-1, AV-2, OV-1a to OV-1c, OV-3, OV-4, StV-5, StV-6, SV-2a to SV-2c, SV-3, SV-6, SV-7, SV-9, SV-12a, SV-12b and AcV-1, have no clean one-to-one match. Read the purpose statement of each candidate NAF v4.1 viewpoint before moving them.

MODAF’s meta-model: M3 and MODEM

The MODAF Meta Model (M3) is the information model behind every MODAF view: it defines the structure of the architectural data that the views present. Its final version, M3 1.2.004, runs to 172 pages and was a profile that extended UML.

MODEM (the MODAF Ontological Data Exchange Mechanism) is its successor. It contains all the M3 elements but was rebuilt on the IDEAS (International Defence Enterprise Architecture Specification) foundation model. The MOD described the difference this way:

It contains all the MODAF elements currently in M3, but has been built from first principles to support enterprise architecture whereas M3 was a profile that extended UML.

UK Ministry of Defence, MODAF guidance on MODEM (GOV.UK)

NAF v4.1 takes a different route. Its NAF Information Model is conceptual and not meant for direct implementation; for building compliant architectures it names two commercial meta-models, ArchiMate and the UAF Domain Meta-model, and points to the NATO Interoperability Standards and Profiles (NISP) for the versions required.

Inherited a MODAF model? What to do now

Treat the MODAF model as the source format and NAF v4.1 as the target, since the MOD’s own guidance now points to NAF v4. In practice:

  • Place each view. Use the crosswalk above, and read the NAF v4.1 purpose statement before moving any view without a clean match.
  • Pick the meta-model. NAF v4.1 accepts ArchiMate or the UAF Domain Meta-model; check NISP for the versions your customer requires.
  • Keep the MODAF documents. The 1.2.004 viewpoint guides on GOV.UK are still the best record of what each legacy view was meant to contain.
  • Check the view names. NAF v4.1 renamed several viewpoints in March 2026, so mappings written against the 2020 edition may use the old names.

FAQs

What does MODAF stand for?

MODAF stands for Ministry of Defence Architecture Framework, also written MOD Architecture Framework. It is the UK Ministry of Defence’s enterprise architecture framework, first released in 2005 and withdrawn on 15 January 2021 in favor of the NATO Architecture Framework version 4 (NAF v4).

Is MODAF still used?

Not for new work. The MOD withdrew its MODAF guidance on 15 January 2021, stating that MODAF has been replaced with NAF v4. The MODAF 1.2.004 documents remain downloadable from GOV.UK, so legacy MODAF models can still be read and migrated. NATO’s current edition of the successor is NAF v4.1, published in March 2026.

How many viewpoints and views does MODAF have?

MODAF 1.2.004 has seven viewpoints (All Views, Strategic, Operational, Service Oriented, Systems, Technical Standards and Acquisition) and 47 views. Sources that say six viewpoints describe MODAF before version 1.2, which added the Service Oriented Viewpoint in 2008.

What is the difference between MODAF and DoDAF?

MODAF was built from DoDAF version 1.0 and extended for UK needs. It added a Strategic Viewpoint for capability planning and an Acquisition Viewpoint for program planning, later a Service Oriented Viewpoint, and it modeled flows of energy, materiel and people between nodes, not just information.

What replaced MODAF?

The NATO Architecture Framework version 4 (NAF v4). Its current edition, NAF v4.1 (document version 2026.03), arranges viewpoints in a grid of five rows (Concepts, Service, Logical, Physical Resource and Architecture Foundation) and accepts ArchiMate or the OMG UAF Domain Meta-model for building compliant architectures.

What is OV-1 in MODAF?

OV-1 is the operational concept, split into three views: OV-1a High-Level Operational Concept Graphic, a free-form picture and the only Pictorial view in MODAF; OV-1b Operational Concept Description, the text that explains the graphic; and OV-1c Operational Performance Attributes, the measures of effectiveness.

How this page was checked

Checked 7 October 2026 against primary sources only: the MOD’s MODAF 1.2.004 documentation and withdrawal notice on GOV.UK, NATO’s NAF v4.1 (document version 2026.03) and the OMG UAF 1.3 specification page. The view names and categories were read from the MOD’s own view summary and 1.2.004 contents pages, not from secondary summaries.

Corrections in this revision: an earlier version of this page said MODAF had six viewpoints (it has seven), described a six-step process and a six-element meta-model that do not appear in the MOD’s documentation, and did not say that MODAF had been withdrawn. The process infographic has been relabeled with the steps the MOD actually published.

Sources

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