---
name: hv-analysis
description: Horizontal-vertical deep research skill for products, companies, concepts, technologies, and people.
---

# Horizontal-Vertical Analysis

Use this skill when the user wants a deep, structured research report on a product, company, concept, technology, or person.

## Method

The method has two axes:

- Vertical axis: trace the full timeline from origin to present
- Horizontal axis: compare with peers or competitors at the same point in time

The final report should combine both into a single judgment.

## Workflow

1. Collect sources through web research and, when relevant, arXiv.
2. Build the vertical narrative.
3. Build the horizontal comparison.
4. Write the cross-section insight.
5. Turn the final Markdown into a polished PDF.

## Research rules

- Use primary sources when possible.
- Do not rely on memory alone.
- Record the source URL and access time.
- If the object is academic or technical, check arXiv.

## Writing rules

- Write as a narrative, not a timeline dump.
- Explain why decisions were made, not just what happened.
- Use concrete facts and specific examples.
- Avoid consulting-style filler.
- Use clear sections and good pacing.

## Output

Produce a well-formatted PDF report with:

- Definition
- Vertical analysis
- Horizontal analysis
- Cross-section insight
- Sources

## Suitability

Good for:

- Competitor research
- Company background research
- Concept analysis
- Technology research
- Person research

Not for:

- Simple dictionary definitions
- Long-form article writing
