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05 / DSD

UI/UX Design Specification Document

How should the product look, feel, and behave through the interface?

The UI/UX Design Specification Document translates product behavior into interface specifications. It defines how screens, components, states, interactions, responsive behavior, and visual decisions should be represented in the product experience.

Layer
Design
Primary purpose
Define how product behavior is represented through the interface.
Used by
Product / Design / Engineering / AI
On this page
  1. 01What is it?
  2. 02Why do we need it?
  3. 03When do we create it?
  4. 04Who benefits from it?
  5. 05What does it contain?
  6. 06What does it NOT contain?
  7. 07What does a design specification look like?
  8. 08Design specification elements
  9. 09How does AI use it?
  10. 10How does it connect to other documents?
  11. 11Example
  12. 12Template
  13. 13Common mistakes
01

What is it?

The UI/UX Design Specification Document defines how product functionality and user flows should be represented through the interface. It translates behavioral requirements into concrete interface specifications without defining the underlying technical implementation.

  • FSD

    What

  • BRD

    Rules

  • UFD

    Behavior

  • DSD

    Experience

  • TAD

    Implementation

02

Why do we need it?

A user flow can tell us what happens, but it does not define how that behavior should be represented through the interface. A design specification makes important interface decisions explicit before implementation.

Without DSD

User Flow
Interpretation
UI decisions during implementation
Inconsistent experience

With DSD

User Flow
Interface specification
Defined states / interactions
Implementation
03

When do we create it?

The DSD is created once the product functionality, business rules, and important user flows are sufficiently understood to define the corresponding interface experience.

This is an information relationship, not a rigid waterfall. Design decisions can expose new behavioral or product questions that require clarification.

FSD
BRD
UFD
DSD
DDD / ASD / TAD
Implementation
04

Who benefits from it?

  • Product

    Uses it to ensure the intended product experience is represented consistently.

  • Design

    Uses it as the explicit source of interface and interaction decisions.

  • Engineering

    Uses it to understand what the interface should display, how it should respond, and which states need to be supported.

  • AI agent

    Uses it as the interface specification when implementing screens and components.

05

What does it contain?

These are the fields a design specification can define.

  1. 01

    Design Principles

    The principles that guide interface decisions.

  2. 02

    Visual Language

    Typography, color, spacing, borders, elevation, iconography, and other visual foundations.

  3. 03

    Layout Structure

    How content and interface elements are organized.

  4. 04

    Screen Specifications

    What each screen or view needs to contain.

  5. 05

    Component Specifications

    How reusable interface components behave.

  6. 06

    Interaction Behavior

    What happens when users interact with interface elements.

  7. 07

    UI States

    States such as default, loading, empty, error, disabled, success, and other relevant conditions.

  8. 08

    Responsive Behavior

    How the interface adapts across viewport sizes.

  9. 09

    Accessibility

    Requirements that affect how the interface can be perceived and operated.

  10. 10

    Motion

    Transitions and animation behavior when motion is part of the experience.

  11. 11

    Content / Data Presentation

    How important information should be represented within the interface.

  12. 12

    Design Decisions

    Important decisions that should remain explicit for future implementation.

06

What does it NOT contain?

  • Product vision
  • Product goals
  • Feature scope
  • Business rules
  • Complete user journeys
  • Database schema
  • API contracts
  • Technical architecture
  • Application code
  • Deployment configuration

UFD

What happens?

DSD

How is that experience represented?

DDD / ASD / TAD

How is it technically implemented?

07

What does a design specification look like?

Design specification

Screen ID
SCREEN-009
Screen name
Create Project
Related feature
FEAT-004
Related flow
FLOW-001

Purpose

Provide the interface through which an authenticated user creates a project.

Entry state

The user has reached the Create Project experience.

Content

The screen presents the information and actions required to complete the flow.

Interaction

The interface responds to user input and submission according to the defined flow and business rules.

States

  • Default
  • Loading
  • Validation / Error
  • Success
  • Empty, when relevant
  • Disabled, when relevant

Responsive

The experience adapts to supported viewport sizes without changing the underlying task or business behavior.

Accessibility

The interface must support the defined accessibility requirements for interaction, content, focus, and feedback.

This is a methodology example, not an actual product screen specification — exact field names, labels, colors, and component choices are not defined here.

08

Design specification elements

  1. 01

    Screen

    A defined interface view or state.

  2. 02

    Component

    A reusable interface element.

  3. 03

    State

    A defined visual and interaction condition.

  4. 04

    Interaction

    How the interface responds to user action.

  5. 05

    Layout

    How content and interface elements are organized.

  6. 06

    Responsive

    How the experience adapts across supported viewport sizes.

  7. 07

    Accessibility

    How the experience supports accessible interaction and perception.

  8. 08

    Motion

    How transitions or animations communicate changes when applicable.

  9. 09

    Content

    How important information, labels, feedback, and data are represented.

09

How does AI use it?

The DSD gives the AI agent explicit interface decisions. It tells the agent what screens and states need to exist, how interactions should behave, how the experience should respond across supported sizes, and which design decisions have already been made.

DSD
Interface specification

AI understands

  • What screens exist
  • What states exist
  • What components are required
  • How interactions behave
  • How layouts adapt
  • What accessibility requirements apply
  • Which design decisions are already defined

Behavior

UFD

Experience

DSD

Technical structure

TAD

Agent behavior

AI Instructions

The DSD tells AI what interface experience to implement. It does not tell AI how to architect the entire application.

10

How does it connect to other documents?

FSD

Create Project

“What capability exists?”

BRD

Project creation rules

“What conditions apply?”

UFD

Create Project flow

“How does the journey behave?”

DSD

Create Project interface

“How should the experience be represented?”

DDD

“What data is required?”

ASD

“How does the interface communicate?”

TAD

“How is the implementation structured?”

The DSD translates behavioral requirements into explicit interface decisions that engineering can implement.

Feature

FEAT-004

Rule

RULE-001

Flow

FLOW-001

Screen

SCREEN-009

11

Example

Feature concept

Create a Project

DSD perspective

The interface represents the journey through defined screens, states, interactions, responsive behavior, and feedback.

PRD

Why

Users need a way to organize their work into projects.

FSD

What

Users can create a project.

BRD

Rules

The project creation process follows defined business rules.

UFD

Behavior

The user moves through the project creation journey and reaches a defined outcome.

DSD

Experience

The interface represents the journey through defined screens, states, interactions, responsive behavior, and feedback.

DDD

Data

What information is stored.

ASD

Communication

How the client communicates.

TAD

Structure

How the capability is structured.

DR

Order

When it should be implemented.

AI Instructions

Implementation

How the agent should implement the task.

12

DSD Template

dsd-template.md

# UI/UX Design Specification Document

## 01. Design Principles

## 02. Visual Language

## 03. Layout Structure

## 04. Screen Specification

### Screen ID

### Screen Name

### Purpose

### Related Feature

### Related Flow

### Entry State

### Content

### Interactions

### States

### Responsive Behavior

### Accessibility

### Motion

### Design Decisions

---

## 05. Component Specification

### Component ID

### Component Name

### Purpose

### States

### Interaction

### Responsive Behavior

### Accessibility
13

Common mistakes

  • Turning the DSD into a collection of screenshots without explaining behavior.
  • Defining business rules inside visual specifications.
  • Repeating complete user flows inside every screen specification.
  • Specifying implementation details instead of interface behavior.
  • Leaving important states undocumented.
  • Ignoring responsive behavior.
  • Ignoring accessibility.
  • Defining visual values without explaining the design decision when the decision matters.
  • Creating screen specifications that are disconnected from actual user flows.
  • Letting AI invent interface decisions that were never documented.