# Nested radial cascade: four levels of one incident (Control-room concepts example)

> WestCoast Charts 1.1.5, release, public Core release, on npm. HTML: https://westcoast-charts.com/gallery/concepts/nested-radial-cascade/ · Index for agents: https://westcoast-charts.com/llms.txt

One ring, four levels: Sector › Subsystem › 48 components › anomalies, with dependency ribbons at the core and the last six hours as a heat ring. The story: the 18:20 checkout deploy pushes eu gateways, queues, redis and postgres into the red, and it shows up as revenue at risk. Hover or click any level; the others follow.

- Chart composition: see the embedded example (interactive charts)
- Collection: Control-room concepts · Control-room concepts
- Standalone example: https://westcoast-charts.com/embed/samples/wcc/gallery/premium/concepts/nested-radial-cascade.html

## Setup

```js
import WestCoastCharts from 'west-coast-charts'
import types from 'west-coast-charts/types'
import premium from 'west-coast-charts/premium'
import readability from 'west-coast-charts/features/readability'

WestCoastCharts.use(types).use(premium).use(readability)
const WestCoastChartsPremium = premium
WestCoastCharts.setLicenseKey(LICENCE_KEY) // paid production licence; localhost evaluation needs no key
```

## Options

This example builds its charts with page controls and helpers, so there is no single options object. Read the standalone example for the source.

## Verify

- Text check (Library 1.1.5): load `west-coast-charts/agent/describe` and call `chart.describe({ format: "json" })` for the actual drawn state. The live reader is on this example’s HTML page.
- Command line (Public agent tools 0.2.3, tested with Library 1.1.5; available from the versioned GitHub release and npm, https://westcoast-charts.com/docs/cli/index.md): `wcc chart export concepts-nested-radial-cascade.json --out concepts-nested-radial-cascade.svg --with-table` (save the options above as JSON first)