> ## Documentation Index
> Fetch the complete documentation index at: https://docs.vortexiq.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Nerve Centre Concepts, Vortex IQ Documentation

> The concepts behind the Vortex IQ Nerve Centre KPI catalogue: the card model, Key Metrics/cross-platform/standard tiers, sentiment, time windows, data freshness, the alert system, cross-platform kill-shots, multi-currency and multi-property handling.

The Vortex IQ **Nerve Centre** tracks thousands of KPI pulses across 200+ connectors. These concept pages explain the shared model behind every card, how to read them, why they are tiered, and how cross-platform cards fuse data across connectors.

| Concept                                                                                                    | What it covers                                                                                                                  |
| ---------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------- |
| [The KPI Model](/nerve-centre/kpi-cards/concepts/kpi-model)                                                | Every KPI is a card with a fixed metadata shape: id, label, category, format, time window, sentiment, alert, tier.              |
| [Key Metrics, Cross-Platform & Standard Tiers](/nerve-centre/kpi-cards/concepts/hero-cross-platform-tiers) | Key Metrics cards answer the top-3 daily questions, cross-platform cards are the kill-shots, standard cards fill the long tail. |
| [The Sentiment Model](/nerve-centre/kpi-cards/concepts/sentiment-model)                                    | The green/red/amber colour each card carries, decided per metric by `sentiment_key`, including dual-axis sentiment.             |
| [Time Windows](/nerve-centre/kpi-cards/concepts/time-windows)                                              | The window vocabulary every card runs over: T, 24H, 7D, 30D, 90D, RT, vsP, and when each is used.                               |
| [Data Freshness](/nerve-centre/kpi-cards/concepts/data-freshness)                                          | Where a card's data comes from and how fresh it is: Native, API-derived, Derived, Real-time, Backdated, Hist, Cost.             |
| [The Alert System](/nerve-centre/kpi-cards/concepts/alert-system)                                          | How any card fires an alert when its metric crosses a threshold, routing into the Actions Kanban for triage.                    |
| [Cross-Platform Kill-Shots](/nerve-centre/kpi-cards/concepts/cross-platform-kill-shots)                    | Cards that join two or more connectors to compute a value neither tool alone can produce.                                       |
| [Multi-Currency](/nerve-centre/kpi-cards/concepts/multi-currency)                                          | Per-currency display, FX translation for cross-currency aggregation, and the avg / total pattern commerce cards use.            |
| [Multi-Property & Multi-Account](/nerve-centre/kpi-cards/concepts/multi-property-and-multi-account)        | One OAuth token, many properties or campaigns (the `parent_integration_id` pattern), each rendered as separate cards.           |