How to Write Development Specifications So Nobody Has Questions
A systems analyst's methodology for creating comprehensive development specifications that serve as practical guides for developers, covering frontend screen descriptions, data models, use cases, and backend algorithms.
Author: Alina Grishko, Lead Systems Analyst at the Corporate Systems Department, LANIT
The Core Idea
A quality specification is a description attached to a development task. It's not just reporting documentation — it's a practical guide for developers and a source of knowledge about the system. The article describes a methodology for creating development specifications for information systems.
Key Components of a Specification
A quality specification should contain four artifacts:
- Screen form descriptions — defines the behavior rules for each UI element
- Data model — entity schema and their relationships
- Use cases — user scenarios
- Algorithms — step-by-step system behavior logic
Frontend Specification
The main artifact for frontend developers is the screen form description, consisting of a prototype and its detailed description. The description should include:
- Element reference (using the name from the mockup)
- Element purpose
- Required status (direct or conditional)
- Attribute type (filter, search field, sort, input/output, dates, dropdowns, checkbox, radio button, button, link)
- Data source
- Placeholder
- Default value
- Default sorting
- Display/activity conditions
- Editability
- Comments
The author recommends arranging elements in the order they appear on the prototype and extracting common interface parts into a separate requirements section.
Backend Specification
Data Model
The data model includes: table/entity name, attribute names, logical data typing, field requirement status, and default values.
Algorithms
Algorithms detail the system's actions when use cases are initiated. They should include:
- Input and output parameters
- Step-by-step actions
- Error handling logic
- Alternative sub-algorithms
- Reference to the initiating use case
- Process diagram (in addition to text description)
Integrating the Artifacts
After writing the frontend and backend specifications, you need to enrich the use case descriptions with information about which screen forms trigger them and which algorithms they initiate. This ensures the entire documentation is interconnected.
Practical Tips
- Don't repeat descriptions of common interface elements in every specification
- Remove inapplicable characteristics to avoid information overload
- If validation descriptions become too complex, move that logic to a backend algorithm
- Add screenshots in addition to prototype links
- Include a general description of the screen form, its purpose, and target audience
Final step: Re-read the specifications, create a task in the task tracker, attach all artifacts, and discuss possible clarifications with the developer.
