Reference Models: TRM and III-RM

Why This Topic is Important

Understanding reference models is crucial for enterprise architects because they provide standardized frameworks for organizing and categorizing technology and information. The Technical Reference Model (TRM) and III-RM (Information Infrastructure Reference Model) are foundational concepts in TOGAF that help architects:

• Communicate architecture concepts consistently across organizations
• Provide a common language for stakeholders
• Ensure alignment between business requirements and technical solutions
• Identify gaps in current technology stacks
• Support governance and compliance efforts

What Are Reference Models?

Reference Models are abstract frameworks that provide a structure for understanding complex domains. In TOGAF, they serve as templates that organizations can customize based on their specific needs.

The Technical Reference Model (TRM)

The TRM is a standard that provides a way of categorizing the services and functions offered by an information technology platform. It consists of:

• Applications: Business applications that process data and deliver services to users
• Infrastructure Services: The technical services that support applications, organized into four categories

The four Infrastructure Service Categories in TRM:

• Communications Services: Enable information exchange (networks, messaging, collaboration)
• Computing Services: Process and store data (servers, processing, storage)
• Business Applications Services: Support business processes (CRM, ERP, SCM)
• Technical Support Services: Enable management and operation (monitoring, security, administration)

The Information Infrastructure Reference Model (III-RM)

The III-RM is specifically focused on information management and consists of:

• Information and Data: The content that flows through systems
• Applications: Software that manages and processes information
• Computing Infrastructure: Hardware and systems supporting application execution
• Communications Infrastructure: Networks enabling information flow

How Reference Models Work

1. Standardization and Categorization

Reference models organize technology into logical categories, allowing architects to:

• Map existing systems to standard categories
• Identify redundancies and gaps
• Compare different solutions within the same category

2. Customization and Specialization

Organizations take the generic reference model and create their own Domain-Specific Architecture models by:

• Adding organization-specific services
• Removing irrelevant services
• Specifying implementation details

3. Gap Analysis

Reference models enable architects to perform gap analysis by:

• Documenting current state (As-Is) using the reference model structure
• Defining desired state (To-Be) using the reference model structure
• Identifying missing services or capabilities
• Planning transition activities

4. Communication and Governance

Reference models serve as a common vocabulary for:

• Architecture discussions with stakeholders
• Technology governance decisions
• Compliance and standards compliance
• Technology roadmap planning

Key Characteristics of TRM and III-RM

Similarities:

• Both are reference models provided by TOGAF
• Both serve as templates for customization
• Both organize technology into logical service categories
• Both support architecture governance and decision-making

Differences:

• TRM focuses on overall technical infrastructure and services across the entire platform
• III-RM specifically emphasizes information and data management aspects
• TRM is broader in scope; III-RM is more specialized for information-centric architectures

Practical Application in Architecture

Step 1: Understand the Organization's Context

Before applying either model, understand:

• Business objectives and drivers
• Current technology landscape
• Organizational constraints and opportunities
• Stakeholder concerns and priorities

Step 2: Map Current State

Document existing systems and services using the reference model:

• Identify which reference model services are currently implemented
• Document the actual solutions in use
• Note gaps and redundancies

Step 3: Define Target State

Using the reference model, design the desired future state:

• Decide which reference model services are needed
• Select target technologies and solutions
• Plan the architecture roadmap

Step 4: Plan Transition

Create detailed plans for moving from current to target state:

• Prioritize changes
• Plan dependencies and sequencing
• Establish metrics and success criteria

Exam Tips: Answering Questions on Reference Models: TRM and III-RM

Tip 1: Know the Core Definitions

Be prepared to define:

• Reference Model: A template or framework that provides a standard way of organizing and categorizing concepts in a domain
• TRM: The Technical Reference Model that categorizes technology services into applications and infrastructure services
• III-RM: The Information Infrastructure Reference Model focused on information management

Tip 2: Understand the Structure

Remember the four infrastructure service categories in TRM:

• Communications Services
• Computing Services
• Business Applications Services
• Technical Support Services

For III-RM, remember the four layers:

• Information and Data
• Applications
• Computing Infrastructure
• Communications Infrastructure

Tip 3: Recognize the Purpose and Benefits

Exam questions often ask why organizations use reference models. Key benefits include:

• Providing a common language and framework
• Enabling gap analysis and planning
• Supporting governance decisions
• Facilitating communication with stakeholders

Tip 4: Distinguish Between TRM and III-RM

When asked to choose between them, remember:

• Use TRM for general technology architecture and broad infrastructure considerations
• Use III-RM when the focus is specifically on information, data management, and information systems

Tip 5: Apply to Scenarios

Scenario questions might ask how to:

• Identify gaps: Map current systems to reference model categories and identify missing services
• Plan improvements: Use reference model as basis for defining target state
• Communicate with stakeholders: Use reference model to explain architecture in standard terms

Tip 6: Remember Customization is Key

TOGAF reference models are not rigid templates. Organizations must:

• Customize them to their specific context
• Add or remove services based on business needs
• Tailor them to their industry and organizational structure

Tip 7: Connect to Architecture Activities

Reference models support key TOGAF activities:

• Architecture Development Method (ADM): Reference models inform multiple phases (B, C, D)
• Phase B (Business Architecture): Understand business needs that drive technical requirements
• Phase C (Information Systems Architecture): TRM and III-RM directly apply here
• Phase D (Technology Architecture): TRM is essential for planning technology services

Tip 8: Look for Key Words in Questions

When you see these phrases, think about reference models:

• "Categorizing services" → Reference model provides the categories
• "Gap analysis" → Compare current state against reference model to identify gaps
• "Common language" → Reference models enable standardized communication
• "Technology planning" → Reference models guide what services are needed
• "Governance framework" → Reference models support decision-making

Tip 9: Practice Gap Analysis Scenarios

Many exam questions involve gap analysis. The process is:

1. Identify current services using reference model categories
2. Identify target services using reference model categories
3. Highlight the differences (gaps)
4. Propose solutions to close gaps
5. Plan transition activities

Tip 10: Remember the Relationship to Other TOGAF Concepts

Reference models connect to:

• Architecture Principles: Guide how services are implemented
• Architecture Standards: Specify which technologies to use in each service category
• Architecture Patterns: Show how services work together
• Architecture Governance: Use reference models to make technology decisions

Common Exam Question Types

Type 1: Definition Questions

Example: "What is the primary purpose of a reference model?"
Answer approach: Focus on standardization, categorization, and common language.

Type 2: Distinction Questions

Example: "Which reference model would you use to emphasize information management?"
Answer approach: The III-RM is information-focused; TRM is broader technical infrastructure.

Type 3: Application Questions

Example: "An organization wants to identify missing technology services. How would you use a reference model?"
Answer approach: Map current services to reference model, identify categories with no service, plan to add services to fill gaps.

Type 4: Benefit/Value Questions

Example: "Why is using a standard reference model beneficial for architecture governance?"
Answer approach: Provides consistent framework, enables comparative evaluation, supports aligned decision-making.

Type 5: Scenario Questions

Example: "Your organization has inconsistent technology selections across business units. How would reference models help?"
Answer approach: Reference models provide standardized categories and services, enabling consistent selection and comparison.

Final Checklist for Exam Preparation

Before your exam, ensure you can:

• ✓ Define Reference Models, TRM, and III-RM clearly
• ✓ List the four infrastructure service categories in TRM
• ✓ Describe the four layers of III-RM
• ✓ Explain how organizations customize reference models
• ✓ Describe the gap analysis process using reference models
• ✓ Identify when to use TRM versus III-RM
• ✓ Connect reference models to ADM phases
• ✓ Explain how reference models support governance
• ✓ Provide examples of how reference models are used in practice
• ✓ Distinguish between reference models and domain-specific models

Summary

Reference models, particularly the TRM and III-RM, are fundamental to TOGAF architecture. They provide:

• A standardized framework for categorizing technology and information services
• A common language for architects and stakeholders
• A basis for gap analysis and planning
• A foundation for governance and decision-making

The key to exam success is understanding that reference models are templates, not prescriptions. Organizations must customize them to their specific context while maintaining the benefits of standardization. By mastering the structure, purpose, and application of TRM and III-RM, you'll be well-prepared to answer exam questions and, more importantly, to apply these concepts in real-world architecture situations.