# See related classifications across CSI standards

Move between related classifications in MasterFormat, UniFormat, and OmniClass.

## What is a crosswalk?

**Crosswalks are links between standards and related classifications.** Use a Crosswalk when you have a classification in one CSI standard and want to find related classifications in another.

> **In simple terms**
>
> Crosswalks connect standards—for example, MasterFormat → UniFormat, MasterFormat → OmniClass, or UniFormat → MasterFormat.

```text
UniFormat
A — Substructure
    ↓
Crosswalk
    ↓
MasterFormat
Division 03 — Concrete
Division 31 — Earthwork
```

The application data connects UniFormat Substructure to related MasterFormat work in Concrete and Earthwork.

Crosswalks do not show edition upgrades. Use [Transitions](/docs/edition-transitions) to understand changes from MasterFormat 2020 to MasterFormat 2026.

## Are Crosswalks and Transitions the same?

No. Crosswalks connect related classifications across different CSI standards. Transitions support upgrades between editions of a standard.

## Open a crosswalk

1. Search for and open the classification you know.

2. Find Crosswalks on the classification.

3. Select a related classification.

4. Confirm its standard and edition in the new tab.

## How relationships work

A crosswalk is not necessarily a one-to-one match. One classification may relate to several classifications in another standard, and several classifications may relate to one classification.

## Compare related classifications

- Confirm the source and related standards.

- Compare classification titles and available explanatory fields.

- Review parent and child context on both sides.

- Keep the source record tab open while exploring related classifications.

Source: https://theconstructionstandard.com/docs/crosswalks