You put in a good deal of time and energy into a new design, only to find that the development team are unable to build it as you had imagined. Most designers will come across this frustrating scenario at some stage, but it is usually avoidable. A good starting point is to create clear, detailed design specifications.
What Are Design Specifications?
Design specifications aid the product and engineering teams in agreeing on the way in which a design is to be implemented.
Design specifications, or design specs, give developers the information they need in order to turn a design into a working product, covering aspects such as its appearance, behavior, functionality, and the requirements for implementation.
Clear specifications provide a common basis for discussing user needs, technical feasibility, intended interactions, and design requirements. They reduce ambiguity and help teams spot constraints before development progresses too far.
The extent covered by a design specification will vary according to the project; in the case of a visual refresh, it might mainly involve typography, color, spacing, and the styling of components, while a new workflow could call for more detailed documentation dealing with interaction logic, responsive behavior, system states, validation, errors, and edge cases.
Many teams combine a link to a Figma file or to a similar design tool with some additional information in a development ticket on a platform like GitHub or Linear. The ticket gives the relevant context such as the objective, the use case, the requirements, the constraints, and the acceptance criteria, while the design file shows the intended interface and behavior.
The Components of a Design Specification
A typical design specification has two main parts: the design file, usually created in Figma or a similar tool, and the development ticket that provides project and implementation context.
What to include in the design file
The design file is generally the thing that designers have first linked with the phrase "design spec"; it presents the desired experience in the form of clear, ready-to-implement flows, components, states and visual details which developers can examine and refer to.
It should document:
Explain the interaction flows: describe what takes place when users click, tap, enter information, or move from one step to another, and where appropriate include alternative paths, error situations, and ways to recover.
For the visual design aspect, establish the color scheme, typography, and visual details, including icon usage, spacing, and all other visual basics. Create and name shared styles or tokens consistently so designers and developers can refer to them easily.
With regard to layout and responsiveness, record the grid, the alignment rules, the spacing behavior, and the relevant responsive breakpoints.
For the interface components, reusable specifications should be provided for various UI elements such as buttons, inputs, menus, and dialogs, covering the different variants, interaction states, transitions, animations, and other significant behavioral details.
Use real text, images, and other types of media rather than relying on placeholders, and specify the content restrictions as well as the required dimensions or aspect ratios for the images.
The design must adhere to established accessibility standards and should clearly record the details that are not obvious visually, for example, those relating to keyboard navigation, focus order, labels, and
alternative text.
What to include in the development ticket
Many development teams regard a ticket as a kind of agreement among the design, product, and engineering groups, specifying what is to be implemented and setting the criteria for considering the work as complete.
A well-written ticket should provide the context needed to understand both the design and the problem it solves, including:
The project goal and intended user outcome
What is included in—and excluded from—the scope
Functional requirements, such as features and system behavior
Nonfunctional requirements, such as performance, security, and accessibility
Relevant use cases, dependencies, and technical constraints
Known risks and proposed mitigations
Clear acceptance criteria
The information must be tailored to the particular design being implemented and should be developed together with the product owner, the designer, and the technical lead.
The ticket might also contain a screenshot of the approved design, providing developers with a quick visual reference and acting as a record of the agreement the team reached when the ticket was created. However, the screenshot must match the linked design file, which should be the primary source of truth.
When design modifications occur after work has already started, the design and engineering teams should jointly review the change and agree on its scope, priority, and the timeline for implementation. If the change is significant, it might need to be entered as a separate ticket. Clearly document any discrepancies between the ticket, its screenshots, and the most recent Figma file to avoid ambiguity about what needs to be built.
It is usually simpler to prepare, examine, keep up to date, and put into effect smaller design specifications than a single comprehensive document. When a specification becomes hard to navigate or manage, divide it into smaller, clearly defined sections or tickets. The engineering team should help decide how to structure the work, since these divisions can directly affect dependencies, the order of work, and the effort required for implementation.
Create specifications during the design phase
The design specifications are generally put together in the later phases of the design process, after the team has developed and verified the proposed experience. Before settling on the specifications, the team should:
Establish the product’s strategic context and objectives
Conduct the necessary discovery research
Design and prototype flows based on identified user needs
Evaluate the proposed experience through usability testing
Incorporate relevant findings into the design
Drawing up detailed specifications and then putting the resulting design into action takes a good deal of time and effort. Before spending those resources, the team should be sure the solution meets the right user needs, supports the business objectives, and can actually be built. Careful discovery, exploration, and validation will help ensure the work is ready to proceed to development.
Who is in charge of producing the design specifications?
The design team, whatever its composition may be—whether it includes just one generalist or a number of specialists such as product, visual, and content designers—usually has responsibility for the design file; the designers arrange the work and record the visual, behavioral, and interaction details that are needed by developers to implement it.
The product owner, technical lead, or another member of the engineering team typically prepares the development ticket, although responsibility can vary by organization. However, whoever produces it, the design, product, and engineering teams should review the full specification together to confirm its scope, feasibility, and acceptance criteria before work starts.
Examples of Design Specifications
Example 1: A small mobile design
This specification's scope is about right, as it gives the developer all the information needed to understand and efficiently carry out the full design. Attention is given to the way that a website's navigation performs on a mobile device.
The project context is recorded in Linear rather than in the Figma file, ensuring the development team can keep requirements and implementation details in order. The ticket outlines the design objective, the relevant user needs and use cases, and the main findings from the initial research.
The ticket includes a direct link to the Figma file so that developers can always refer to the most up-to-date version of the design.
The annotations in the associated Figma file show how the different screens relate and transition from one to another, helping developers understand how users navigate and interact with the experience.
Example 2: A complex webpage design
This specification sets out the layout, content, and visual design of the entire webpage; the Figma file shows how the page behaves at various responsive breakpoints and lists the color variations the implementation must support.
Annotations are assigned colors according to their purpose or field, which enables developers to go through the file and swiftly spot the information that is relevant to their own work. For instance, back-end requirements appear in red so back-end engineers can find them without sifting through every note.
Figma's comments offer another way to collaborate asynchronously, allowing designers and developers to ask questions, share feedback, and record decisions right next to the design.
Example 3: A component specification
The button specification in Google's Material Design sets out each button variant, interaction state, and configurable property; it provides exact values—such as a height of 40 dp—together with visual guidance and implementation references for both designers and developers.
Tips for Aligning With Developers
Designers and developers can view a solution from different angles, but both perspectives are necessary to create a useful, feasible, well-built product. The following practices can improve communication and collaboration:
Get developers involved at an early stage. Include the engineering team in the design discussions long before the work is completed. When the team prepares the specification, there should already be agreement on the main functionality, behavior, the technical constraints, and the visual direction.
Leave time for the asynchronous review. Send the design file before the review meeting so developers can assess feasibility and leave comments or questions. Use the meeting to address those comments, settle outstanding issues, and make decisions rather than presenting the design for the first time.
Be prepared to make considered trade-offs; although some user needs or design principles are important enough to defend, other details may not warrant a considerable amount of engineering work. Each compromise should be assessed in terms of user value, business impact, technical complexity, and long-term maintainability.
Record and make known all changes. Each time the design changes, update the design file, the annotations, and the development ticket. Inform developers through the team's communication channels, clearly stating what changed, why, and whether it affects scope or timing.
Dworkz is a UI/UX design and development firm based in San Francisco, focused on data-driven B2B SaaS companies. If your team is struggling with software delivery, reach out to us.
