domain-identification-grouping

# Domain Identification and Grouping

This skill groups architectural components into logical domains (business areas) to prepare for creating domain services in a service-based architecture.

## How to Use

### Quick Start

Request analysis of your codebase:

- **"Group components into logical domains"**
- **"Identify component domains for service-based architecture"**
- **"Create domain groupings from components"**
- **"Analyze which components belong to which domains"**

### Usage Examples

**Example 1: Domain Identification**

```
User: "Group components into logical domains"

The skill will:
1. Analyze component responsibilities and relationships
2. Identify business domains based on functionality
3. Group components into domains
4. Create domain diagrams
5. Suggest namespace refactoring for domain alignment
```

**Example 2: Domain Analysis**

```
User: "Which domain should the billing components belong to?"

The skill will:
1. Analyze billing component functionality
2. Check relationships with other components
3. Identify appropriate domain (e.g., Customer or Financial)
4. Recommend domain assignment
```

**Example 3: Domain Refactoring**

```
User: "What namespace refactoring is needed to align components with domains?"

The skill will:
1. Compare current component namespaces to identified domains
2. Identify misaligned components
3. Suggest namespace changes
4. Create refactoring plan
```

### Step-by-Step Process

1. **Identify Domains**: Analyze business capabilities and component relationships
2. **Group Components**: Assign components to appropriate domains
3. **Validate Groupings**: Ensure components fit well in their domains
4. **Refactor Namespaces**: Align component namespaces with domains
5. **Create Domain Map**: Visualize domain structure and component groupings

## When to Use

Apply this skill when:

- After identifying, sizing, and analyzing component dependencies
- Before creating domain services (Pattern 6)
- When planning service-based architecture migration
- Analyzing component relationships and business alignment
- Preparing for domain-driven design implementation
- Grouping components for better organization

## Core Concepts

### Domain Definition

A **domain** is a logical grouping of components that:

- Represents a distinct business capability or area
- Contains related components that work together
- Has clear boundaries and responsibilities
- Can become a domain service in service-based architecture

**Examples**:

- **Customer Domain**: Customer profile, billing, support contracts
- **Ticketing Domain**: Ticket creation, assignment, routing, completion
- **Reporting Domain**: Ticket reports, expert reports, financial reports

### Component Domain Relationship

**One-to-Many**: A single domain contains multiple components

```
Domain: Customer
├── Component: Customer Profile
├── Component: Billing Payment
├── Component: Billing History
└── Component: Support Contract
```

### Domain Manifestation

Domains are physically manifested through **namespace structure**:

**Before Domain Alignment**:

```
services/billing/payment
services/billing/history
services/customer/profile
services/supportcontract
```

**After Domain Alignment**:

```
services/customer/billing/payment
services/customer/billing/history
services/customer/profile
services/customer/supportcontract
```

Notice how all customer-related functionality is grouped under `.customer` domain.

## Analysis Process

### Phase 1: Identify Business Domains

Analyze the codebase to identify distinct business domains:

1. **Examine Component Responsibilities**
   - Read component names and descriptions
   - Understand what each component does
   - Identify business capabilities

2. **Look for Business Language**
   - Group components by business vocabulary
   - Example: "billing", "payment", "invoice" → Financial domain
   - Example: "customer", "profile", "contract" → Customer domain

3. **Identify Domain Boundaries**
   - Where do business concepts change?
   - What are the distinct business areas?
   - How do components relate to business capabilities?

4. **Collaborate with Business Stakeholders**
   - Validate domain identification with product owners
   - Ensure domains align with business understanding
   - Get feedback on domain boundaries

**Example Domain Identification**:

```markdown
## Identified Domains

1. **Ticketing Domain** (ss.ticket)
   - Ticket creation, assignment, routing, completion
   - Customer surveys
   - Knowledge base

2. **Customer Domain** (ss.customer)
   - Customer profile
   - Billing and payment
   - Support contracts

3. **Reporting Domain** (ss.reporting)
   - Ticket reports
   - Expert reports
   - Financial reports

4. **Admin Domain** (ss.admin)
   - User maintenance
   - Expert profile management

5. **Shared Domain** (ss.shared)
   - Login
   - Notification
```

### Phase 2: Group Components into Domains

Assign each component to an appropriate domain:

1. **Analyze Component Functionality**
   - What business capability does it support?
   - What domain vocabulary does it use?
   - What other components does it relate to?

2. **Check Component Relationships**
   - Which components are frequently used together?
   - What are the dependencies between components?
   - Do components share data or workflows?

3. **Assign to Domain**
   - Place component in domain that best fits its functionality
   - Ensure component aligns with domain's business language
   - Verify component relationships support domain grouping

4. **Handle Edge Cases**
   - Components that don't fit clearly: Analyze more deeply
   - Components that fit multiple domains: Choose primary domain
   - Shared components: May belong to Shared domain

**Example Component Grouping**:

```markdown
## Component Domain Assignment

### Ticketing Domain (ss.ticket)

- Ticket Shared (ss.ticket.shared)
- Ticket Maintenance (ss.ticket.maintenance)
- Ticket Completion (ss.ticket.completion)
- Ticket Assign (ss.ti