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# How to Write Requirements for an Internal System
- URL: https://blog.jestor.com/write-requirements-internal-system/
- Published: 2026-09-17T22:31:06.000Z
- Updated: 2026-09-17T22:31:06.000Z
- Author: Bruno Bannach

To **write requirements for an internal system**, describe the records, the phases they move through, and the rules that govern them. Screens come last, because they are a consequence of the other three.

## Why requirements documents fail

Most attempts to **write requirements for an internal system** describe the interface someone imagined rather than the process that exists.

- Screens specified before anyone defined what a record is
- Rules discovered during build rather than before it
- Fields listed without saying which are required and why
- No statement of who may see or change what

## What a usable specification contains

| Element           | What to state                                               |
| ----------------- | ----------------------------------------------------------- |
| **The record**    | What one row represents — a payment, a ticket, a candidate  |
| **Fields**        | What each holds, its type, and whether it is required       |
| **Relationships** | What each record connects to, and in which direction        |
| **Phases**        | The stages the record moves through, and what triggers each |
| **Permissions**   | Who sees, edits, and acts, by role                          |

## How to turn it into a build in Jestor

1. Create the table in **Jestor** for the record you defined, with the fields and their types.
2. Choose field types deliberately — currency for money, date for deadlines, connected for relationships.
3. Add the phases as a single-select field, enabling log metrics so timing is captured.
4. Build the app over it with the view that matches how the work moves.
5. Apply permissions by role, field, and action.

## Why choose Jestor for specification-to-build?

When you **write requirements for an internal system**, **Jestor** maps almost directly onto the result: records become tables, relationships become connected fields, phases become a board, and rules become conditionals and automations.

That closeness is why the **AI** builder works well from a plain-text description — a clear specification is already most of the way to a build.

## Frequently Asked Questions

### Should I specify screens first?

No — records, relationships, and phases come first. See [jestor.com](https://jestor.com/?ref=blog.jestor.com).

### Why do field types matter?

Formulas and automations cannot calculate on text.

### Can AI build from a written specification?

Yes, and it asks clarifying questions before building.

## Video Tutorial: Step by Step

Check out other practical tutorials on the Jestor YouTube channel.

## Get to know Jestor

With **Jestor**, you can automate workflows, connect teams, and build internal systems your way — all without code and powered by **AI**. Discover Jestor at [jestor.com](https://jestor.com/?ref=blog.jestor.com) and see how to take your company's operations to a new level of efficiency and control.