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---
name: ck-sequential-thinking
description: Apply step-by-step analysis for complex problems with revision capability. Use for multi-step reasoning, hypothesis verification, adaptive planning, problem decomposition, course correction, debugging with unclear scope.
---
# ck-sequential-thinking
Structured problem-solving via manageable, reflective thought sequences with dynamic adjustment capability.
## When to Use
- Complex problem decomposition where scope is unclear
- Adaptive planning with revision capability
- Analysis needing course correction mid-process
- Problems with unclear or emerging scope
- Multi-step solutions requiring context maintenance across steps
- Hypothesis-driven investigation or debugging
## Don't Use When
- Problem is straightforward with a clear, direct solution
- Quick lookup or simple retrieval task
- Single-step action with no branching needed
## Core Process
### 1. Start with Loose Estimate
```
Thought 1/5: [Initial analysis]
```
Adjust total dynamically as understanding evolves.
### 2. Structure Each Thought
- Build on previous context explicitly
- Address one aspect per thought
- State assumptions, uncertainties, realizations
- Signal what next thought should address
### 3. Apply Dynamic Adjustment
- **Expand**: More complexity discovered → increase total count
- **Contract**: Simpler than expected → decrease total count
- **Revise**: New insight invalidates previous → mark revision
- **Branch**: Multiple approaches → explore alternatives
### 4. Use Revision When Needed
```
Thought 5/8 [REVISION of Thought 2]: [Corrected understanding]
- Original: [What was stated]
- Why revised: [New insight]
- Impact: [What changes]
```
### 5. Branch for Alternatives
```
Thought 4/7 [BRANCH A from Thought 2]: [Approach A]
Thought 4/7 [BRANCH B from Thought 2]: [Approach B]
```
Compare explicitly, converge with decision rationale.
### 6. Generate & Verify Hypotheses
```
Thought 6/9 [HYPOTHESIS]: [Proposed solution]
Thought 7/9 [VERIFICATION]: [Test results]
```
Iterate until hypothesis verified.
### 7. Complete Only When Ready
Mark final: `Thought N/N [FINAL]`
Complete when:
- Solution verified
- All critical aspects addressed
- Confidence achieved
- No outstanding uncertainties
## Application Modes
**Explicit**: Use visible thought markers when complexity warrants visible reasoning or user requests a breakdown.
**Implicit**: Apply methodology internally for routine problem-solving where thinking aids accuracy without cluttering the response.
## Integration
`ck-sequential-thinking` is called by other skills:
- `ck-debug` uses it for complex root cause tracing
- `ck-fix` uses it for deep complexity assessments
- `ck-web-testing` uses it for analyzing test failure patterns