ITIL and TOGAF

Audience: Enterprise Architecture Practice
Purpose: Establish ITIL as the benchmarking and standards measurement framework for IT operations; clarify its boundary with TOGAF

Framework Boundary Clarification

Concern	Framework	Scope
Architecture design and transformation	TOGAF / ADM	How to change
IT service quality and operational benchmarking	ITIL	How well you run

TOGAF governs the state transition. ITIL measures operational fitness of the current and target states. They are complementary, not competing. EA practice retains TOGAF for architecture governance; ITIL is adopted for IT landscape standards auditing and benchmarking.

What ITIL Provides

ITIL (IT Infrastructure Library) is a globally recognised framework for IT Service Management (ITSM). The current version, ITIL 4, is structured around the Service Value System (SVS) — a model that ensures all components of an organisation work together to create value through IT-enabled services.

Key constructs relevant to benchmarking:

Service Value Chain (SVC) — six activities (Plan, Improve, Engage, Design & Transition, Obtain/Build, Deliver & Support) that map IT activities to business value delivery. Each activity is a measurement point.

Four Dimensions — People & Organisation, Information & Technology, Partners & Suppliers, Value Streams & Processes. These are the lens through which IT landscape health is assessed, directly aligned to EA concerns around capability and dependency mapping.

34 Management Practices — grouped into General, Service, and Technical practices. The most operationally critical for benchmarking are:

Incident Management — MTTR, incident volume, SLA breach rate
Problem Management — recurring incident rate, known error backlog
Change Enablement — change success rate, failed change ratio, emergency change frequency
Service Level Management — SLA/OLA compliance, service availability
Availability Management — uptime percentage, MTBF, MTRS
Capacity & Performance Management — resource utilisation vs. demand forecast
Continual Improvement — improvement initiative throughput, backlog age

Key Benchmarking Metrics by Domain

Service Reliability

Availability: target ≥ 99.5% for Tier 1 services
MTBF (Mean Time Between Failures): trending upward = improving
MTRS (Mean Time to Restore Service): target aligned to business RTO

Change Quality

Change success rate: industry benchmark ≥ 95%
Emergency change ratio: should be < 5% of total changes
Failed changes causing incidents: target < 2%

Incident & Problem

P1/P2 incident frequency: absolute volume and trend
Repeat incidents (no permanent fix): indicator of problem management debt
SLA breach rate: per service tier

Service Desk

First Contact Resolution (FCR): benchmark 70–80%
Ticket backlog age: no ticket > agreed SLA breach threshold

Continual Improvement

Open improvement items vs. closed per quarter
Time-to-implement approved improvements

Integration with EA Practice

The EA team might use ITIL metrics as input signals to the Architecture Development Method (ADM):

Phase A (Architecture Vision): ITIL baseline metrics define current-state pain points
Phase B/C/D (Business/IS/Technology Architecture): SLA and availability targets inform NFRs in target architecture
Phase E/F (Migration Planning): Change success rate and MTRS inform sequencing and risk assessment
Phase G (Implementation Governance): ITIL change enablement gates align with architecture compliance checkpoints
Phase H (Change Management): Continual improvement metrics feed architecture refresh triggers

Maturity Baseline (ITIL CMM Alignment)

ITIL 4 does not prescribe a formal maturity model, but the EA practice should adopt a 5-level maturity scale against each management practice:

Level	Description
1 — Initial	Ad hoc; no defined process
2 — Managed	Process defined but inconsistently applied
3 — Defined	Standardised, documented, measured
4 — Quantitatively Managed	Metrics-driven; SLAs enforced
5 — Optimising	Continual improvement embedded; predictive capability

Target for consolidated IT landscape: Level 3 minimum across all Tier 1 service practices before any significant architecture transformation is initiated. Level 4 for Incident, Change, and Availability management.

Potential Next Steps

Conduct ITIL practice maturity assessment against current IT landscape
Define service tiers (Tier 1/2/3) aligned to business criticality — EA input required
Establish baseline metrics for the 7 priority practices listed above
Set target benchmarks per tier; publish as EA-governed IT Standards Register
Integrate ITIL reporting cadence into Architecture Review Board agenda

Document owner: Enterprise Architecture Practice
Framework references: ITIL 4 Foundation (AXELOS), TOGAF 10 (The Open Group), ICL ADM

© dbj@dbj.org , CC BY SA 4.0