# Capacity headroom

URL: /systems/trust-and-governance/controls/capacity-headroom · Id: `control:capacity-headroom`

> Capacity is forecast from use, and every Interface keeps headroom above its peak load.

Capacity is forecast from use, and every [Interface](/business/nouns/interface) keeps headroom above its peak load.

## Satisfies
| Criterion | Text |
| --- | --- |
| [SOC2 A1.1](/systems/trust-and-governance/criteria/soc2/a1-1) | The entity maintains, monitors and evaluates processing capacity and use to manage demand and add capacity. |
| [ISO27001 A.8.6](/systems/trust-and-governance/criteria/iso27001/a-8-6) | The use of resources is monitored and adjusted in line with current and expected capacity needs. |

## Implemented by
- [Incident response](/workflows/processes/incident-response)
- [Observability](/code/platform/observability)

## Test
| Step | Rule |
| --- | --- |
| Kind | Detective: it finds the failure after it happens. |
| Select | Daily peak load and capacity for each Interface, over the report period. |
| Assert | Peak load stays under the headroom Limit, or an Issue opened the day it crossed. |

## Owner
[Reliability Engineer](/agents/engineering/reliability-engineer), [Engineering Team](/agents/engineering).

## Example
A lesson-booking app's forecast shows peak load reaching 80% of capacity before term starts. An [Issue](/business/nouns/issue) opens that day, and capacity doubles a week before the rush.