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**Table of Contents**

- [DfLSS Prevention Systems - Training Program](#dflss-prevention-systems---training-program)
  - [Program Overview](#program-overview)
  - [Week 1: Compile-Time Guarantees](#week-1-compile-time-guarantees)
    - [Day 1: Theory (Self-Paced, 2 hours)](#day-1-theory-self-paced-2-hours)
    - [Day 2-3: Practice (Pair Programming, 4 hours)](#day-2-3-practice-pair-programming-4-hours)
    - [Day 4: Team Review (1 hour)](#day-4-team-review-1-hour)
    - [Assessment](#assessment)
  - [Week 2: Architectural Integration Contracts](#week-2-architectural-integration-contracts)
    - [Day 1: Theory (Self-Paced, 2 hours)](#day-1-theory-self-paced-2-hours-1)
    - [Day 2-3: Practice (Pair Programming, 4 hours)](#day-2-3-practice-pair-programming-4-hours-1)
    - [Day 4: Team Review (1 hour)](#day-4-team-review-1-hour-1)
    - [Assessment](#assessment-1)
  - [Week 3: Error Propagation Strategy](#week-3-error-propagation-strategy)
    - [Day 1: Theory (Self-Paced, 2 hours)](#day-1-theory-self-paced-2-hours-2)
    - [Day 2-3: Practice (Pair Programming, 4 hours)](#day-2-3-practice-pair-programming-4-hours-2)
    - [Day 4: Team Review (1 hour)](#day-4-team-review-1-hour-2)
    - [Assessment](#assessment-2)
  - [Week 4: DfLSS Design Review + Kaizen](#week-4-dflss-design-review--kaizen)
    - [Day 1: Theory (Self-Paced, 2 hours)](#day-1-theory-self-paced-2-hours-3)
    - [Day 2: Design Review Practice (2 hours)](#day-2-design-review-practice-2-hours)
    - [Day 3: Kaizen Retrospective (2 hours)](#day-3-kaizen-retrospective-2-hours)
    - [Day 4: 5 Whys Analysis (2 hours)](#day-4-5-whys-analysis-2-hours)
    - [Assessment](#assessment-3)
  - [Ongoing Learning](#ongoing-learning)
    - [Monthly Activities](#monthly-activities)
    - [Quarterly Activities](#quarterly-activities)
    - [Continuous Learning](#continuous-learning)
  - [Certification Levels](#certification-levels)
    - [Level 1: Practitioner](#level-1-practitioner)
    - [Level 2: Expert](#level-2-expert)
    - [Level 3: Champion](#level-3-champion)
  - [Success Metrics](#success-metrics)
    - [Individual Success](#individual-success)
    - [Team Success](#team-success)
  - [Training Resources](#training-resources)
    - [Documentation](#documentation)
    - [Code Examples](#code-examples)
    - [External Resources](#external-resources)
    - [Internal Support](#internal-support)
  - [Feedback and Improvement](#feedback-and-improvement)

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# DfLSS Prevention Systems - Training Program

**Version**: 1.0.0
**Audience**: Development team
**Duration**: 4-week rolling program
**Format**: Mix of self-paced and team-based learning

---

## Program Overview

This training program teaches the 5 DfLSS prevention systems:

1. **Compile-Time Guarantees** (PhantomData state machines)
2. **Architectural Integration Contracts** (Trait-based APIs)
3. **Error Propagation Strategy** (Comprehensive error taxonomy)
4. **DfLSS Design Review Process** (Checklist-driven)
5. **Kaizen Continuous Improvement** (Monthly/quarterly cycles)

**Philosophy**: Learn by doing. Each week builds on previous, with hands-on exercises.

---

## Week 1: Compile-Time Guarantees

**Learning Objectives**:
- Understand PhantomData and zero-sized types
- Design type-level state machines
- Prevent invalid state transitions at compile time
- Write compile-time enforcement tests

### Day 1: Theory (Self-Paced, 2 hours)

**Reading** (1 hour):
- `/docs/week3-prevention/PREVENTION_STRATEGY.md` - Section 1
- `/docs/week3-prevention/IMPLEMENTATION_GUIDE.md` - System 1
- Rust Book: Chapter on PhantomData

**Video** (30 min):
- Watch: "Type-Level Programming in Rust" (link TBD)

**Review Code** (30 min):
- Read: `/crates/ggen-core/src/prevention/state_machine.rs`
- Study: How `Registry<State>` enforces transitions

### Day 2-3: Practice (Pair Programming, 4 hours)

**Exercise 1: Simple State Machine** (2 hours)

**Task**: Implement a connection lifecycle state machine.

```rust
// States: Disconnected, Connected, Authenticated
// Transitions:
//   Disconnected -> Connected (via connect())
//   Connected -> Authenticated (via authenticate())
//   Authenticated -> Disconnected (via disconnect())
//
// Prevent:
//   - query() on Disconnected or Connected (only on Authenticated)
//   - authenticate() on Disconnected (must connect first)

pub struct Connection<State = Disconnected> {
    url: String,
    handle: Option<Handle>,
    _state: PhantomData<State>,
}

// TODO: Implement state transitions and methods
```

**Exercise 2: Builder Pattern with Validation** (2 hours)

**Task**: Implement a configuration builder that validates before building.

```rust
// States: Unvalidated, Validated
// Transitions:
//   Unvalidated -> Validated (via validate())
//
// Prevent:
//   - build() on Unvalidated (must validate first)

pub struct ConfigBuilder<State = Unvalidated> {
    settings: HashMap<String, String>,
    _state: PhantomData<State>,
}

// TODO: Implement builder with compile-time validation
```

### Day 4: Team Review (1 hour)

**Activities**:
- Present solutions to team
- Discuss challenges and insights
- Code review of each other's implementations
- Document patterns learned

**Deliverable**: Pull request with working state machines + tests

### Assessment

**Quiz** (15 min):
1. What is PhantomData and why is it zero-sized?
2. How do state machines prevent invalid sequences?
3. When should you use type-level state machines vs. runtime state?

**Practical**: Review teammate's PR and identify:
- Are all invalid transitions prevented?
- Are state-specific methods in correct impl blocks?
- Do tests document prevented errors?

---

## Week 2: Architectural Integration Contracts

**Learning Objectives**:
- Design trait-based API contracts
- Implement contract verification tests
- Handle version compatibility
- Write generic contract tests

### Day 1: Theory (Self-Paced, 2 hours)

**Reading** (1 hour):
- `/docs/week3-prevention/PREVENTION_STRATEGY.md` - Section 2
- `/docs/week3-prevention/IMPLEMENTATION_GUIDE.md` - System 2
- Rust Book: Chapter on Traits

**Review Code** (1 hour):
- Read: `/crates/ggen-core/src/prevention/contracts.rs`
- Study: `TemplateProvider` trait and contract tests

### Day 2-3: Practice (Pair Programming, 4 hours)

**Exercise 1: Define Storage Contract** (2 hours)

**Task**: Design a trait for storage backends (filesystem, S3, database).

```rust
pub trait StorageBackend: Send + Sync {
    fn read(&self, key: &str) -> Result<Vec<u8>, StorageError>;
    fn write(&self, key: &str, data: &[u8]) -> Result<(), StorageError>;
    fn delete(&self, key: &str) -> Result<(), StorageError>;
    fn list(&self, prefix: &str) -> Result<Vec<String>, StorageError>;
    fn version(&self) -> Version;
}

// TODO: Implement contract verification test
// TODO: Implement FilesystemBackend
// TODO: Implement InMemoryBackend (for testing)
```

**Exercise 2: Version Compatibility** (2 hours)

**Task**: Implement version checking for plugin system.

```rust
pub struct PluginLoader {
    required_version: Version,
}

impl PluginLoader {
    pub fn load<P: Plugin>(&self, plugin: P) -> Result<(), PluginError> {
        // TODO: Check plugin.version() is compatible
        // TODO: Return error if incompatible
    }
}

// TODO: Write tests for version compatibility
```

### Day 4: Team Review (1 hour)

**Activities**:
- Present contract designs
- Discuss API choices (Send + Sync? Default methods?)
- Review version compatibility logic
- Identify common patterns

**Deliverable**: Pull request with trait contract + 2 implementations + tests

### Assessment

**Quiz** (15 min):
1. Why use trait contracts vs. concrete types?
2. How do default trait methods provide backward compatibility?
3. What is semantic versioning and how does it relate to API compatibility?

**Practical**: Design a contract for a new subsystem (e.g., logging, caching).

---

## Week 3: Error Propagation Strategy

**Learning Objectives**:
- Design comprehensive error hierarchies
- Use `thiserror` for error types
- Add context to errors
- Write user-friendly error messages

### Day 1: Theory (Self-Paced, 2 hours)

**Reading** (1 hour):
- `/docs/week3-prevention/PREVENTION_STRATEGY.md` - Section 3
- `/docs/week3-prevention/IMPLEMENTATION_GUIDE.md` - System 3
- `thiserror` documentation

**Review Code** (1 hour):
- Read: `/crates/ggen-core/src/prevention/errors.rs`
- Study: `GgenError` hierarchy and error context

### Day 2-3: Practice (Pair Programming, 4 hours)

**Exercise 1: Error Hierarchy** (2 hours)

**Task**: Design error types for database module.

```rust
use thiserror::Error;

#[derive(Error, Debug)]
pub enum DatabaseError {
    // TODO: Add error variants for:
    // - Connection failed
    // - Query syntax error
    // - Constraint violation
    // - Transaction conflict
    // - Timeout
    // Each variant should include:
    //   - Descriptive message
    //   - Context (operation, query, table)
    //   - Suggestion for user
}

// TODO: Implement Result type alias
// TODO: Implement ErrorContext trait
```

**Exercise 2: Error Reporting** (2 hours)

**Task**: Implement user-friendly error reporting.

```rust
pub fn report_error(error: &DatabaseError) {
    // TODO: Print main error message
    // TODO: Print error source chain
    // TODO: Print suggestions
    // TODO: Include debugging hint
}

// TODO: Write tests for error formatting
```

### Day 4: Team Review (1 hour)

**Activities**:
- Present error hierarchies
- Review error messages for clarity
- Discuss error context strategies
- Share error handling patterns

**Deliverable**: Pull request with comprehensive error types

### Assessment

**Quiz** (15 min):
1. What is error context and why is it important?
2. How does `thiserror` simplify error handling?
3. What makes an error message user-friendly?

**Practical**: Review production error logs, identify unclear errors, propose improvements.

---

## Week 4: DfLSS Design Review + Kaizen

**Learning Objectives**:
- Complete design review checklist
- Conduct FMEA (Failure Mode Analysis)
- Apply TRIZ contradiction resolution
- Participate in Kaizen retrospective

### Day 1: Theory (Self-Paced, 2 hours)

**Reading** (1.5 hours):
- `/docs/week3-prevention/DESIGN_REVIEW_CHECKLIST.md`
- `/docs/week3-prevention/KAIZEN_CYCLE_GUIDE.md`
- FMEA tutorial (link TBD)
- TRIZ principles (link TBD)

**Video** (30 min):
- Watch: "Design for Lean Six Sigma in Software"

### Day 2: Design Review Practice (2 hours)

**Exercise**: Complete design review for a feature.

**Task**: You're designing a caching system. Complete the design review checklist.

**Requirements**:
- In-memory cache with TTL (time-to-live)
- Thread-safe access
- Configurable eviction policy (LRU, LFU)
- Metrics (hit rate, miss rate)

**Deliverable**:
- Completed design review checklist
- FMEA table with failure modes
- TRIZ contradiction resolution
- Type-level design (PhantomData if applicable)
- Contract trait definition
- Error taxonomy

### Day 3: Kaizen Retrospective (2 hours)

**Activity**: Participate in team retrospective.

**Agenda**:
1. Review metrics (compiler errors, test failures, cycle time)
2. What blocked us this month?
3. What slowed us down?
4. What caused rework?
5. Prioritize top 3 problems (Pareto 80/20)

**Deliverable**: Retrospective notes + prioritized problems

### Day 4: 5 Whys Analysis (2 hours)

**Exercise**: Conduct 5 Whys for a real problem.

**Task**: Pick one of the top 3 problems from retrospective.

**Process**:
1. State the problem clearly
2. Ask "Why?" 5 times
3. Validate root cause with data
4. Design countermeasures (immediate, prevention, systemic)

**Deliverable**: 5 Whys analysis document

### Assessment

**Practical**: Lead a design review for a real feature.

**Criteria**:
- Checklist completion (all sections)
- FMEA thoroughness (failure modes identified)
- Type-level design quality
- Contract clarity
- Error handling completeness
- Score ≥ 7.0/10

---

## Ongoing Learning

### Monthly Activities

**Week 1**: Kaizen retrospective (identify problems)
**Week 2**: Root cause analysis (5 Whys)
**Week 3**: Implement countermeasures
**Week 4**: Verify improvements

### Quarterly Activities

**Strategic Review** (half-day):
- 3-month metrics trends
- Pattern identification
- DfLSS process updates
- Team training on new techniques
- Set next quarter goals

### Continuous Learning

**Resources**:
- Internal wiki with design review examples
- Code review comments highlighting prevention patterns
- Monthly "Pattern of the Month" presentations
- Quarterly "Lessons Learned" sessions

**Mentorship**:
- New developers paired with experienced for first design review
- Experienced developers lead Kaizen retrospectives
- Rotating facilitator for quarterly reviews

---

## Certification Levels

### Level 1: Practitioner

**Requirements**:
- Complete all 4 weeks of training
- Pass all quizzes (80%+ score)
- Submit all deliverables (PRs, exercises)
- Participate in 1 Kaizen cycle
- Complete 1 design review with mentor

**Recognition**: "DfLSS Practitioner" badge

### Level 2: Expert

**Requirements**:
- 3 months as Practitioner
- Lead 3 design reviews independently
- Facilitate 1 Kaizen retrospective
- Present at quarterly review
- Contribute improvement to DfLSS process

**Recognition**: "DfLSS Expert" badge

### Level 3: Champion

**Requirements**:
- 6 months as Expert
- Mentor 3 new developers through training
- Lead quarterly strategic review
- Publish pattern or technique
- Measurable improvement in team metrics

**Recognition**: "DfLSS Champion" badge + bonus

---

## Success Metrics

### Individual Success

- Training completion rate (target: 100%)
- Quiz scores (target: 80%+ average)
- Design review scores (target: 7.0/10+ average)
- Certification progression (target: 80% Level 1 within 3 months)

### Team Success

- Defect density reduction (target: 50% in 6 months)
- Cycle time reduction (target: 30% in 6 months)
- Rework percentage reduction (target: 40% in 6 months)
- Test pass rate improvement (target: 95%+ in 3 months)
- Team satisfaction (target: 8.0/10+ average)

---

## Training Resources

### Documentation

- `/docs/week3-prevention/PREVENTION_STRATEGY.md`
- `/docs/week3-prevention/IMPLEMENTATION_GUIDE.md`
- `/docs/week3-prevention/DESIGN_REVIEW_CHECKLIST.md`
- `/docs/week3-prevention/KAIZEN_CYCLE_GUIDE.md`

### Code Examples

- `/crates/ggen-core/src/prevention/state_machine.rs`
- `/crates/ggen-core/src/prevention/contracts.rs`
- `/crates/ggen-core/src/prevention/errors.rs`
- `/examples/prevention/`

### External Resources

- Rust Book: https://doc.rust-lang.org/book/
- `thiserror` docs: https://docs.rs/thiserror/
- FMEA Guide: (link TBD)
- TRIZ Principles: (link TBD)

### Internal Support

- Slack channel: #dflss-prevention
- Weekly office hours: Fridays 2-3pm
- Mentor assignments: See team wiki

---

## Feedback and Improvement

This training program follows Kaizen principles - it improves continuously.

**Feedback Mechanisms**:
- End-of-week surveys (anonymous)
- Quarterly training review (team discussion)
- Metrics tracking (training completion, certification rates)
- Exit interviews (developers leaving team)

**Continuous Improvement**:
- Update content based on feedback
- Add exercises for challenging concepts
- Create videos for complex topics
- Simplify exercises that are too difficult
- Expand exercises that are too easy

---

**Next Steps**:

1. **Enroll** in Week 1 training (notify your manager)
2. **Block calendar** for training time (2 hours/day)
3. **Find pair programming partner** (for exercises)
4. **Join Slack channel** #dflss-prevention
5. **Start reading** Prevention Strategy guide

**Remember**: Prevention is 10x cheaper than detection. This training is an investment that pays dividends forever.
