What is Technical Specification? — UK Software Development Guide

4 min readJune 2025ClickMasters Technical TeamReviewed by James Whitmore, CTO
what is a technical specification

Direct Answer

A technical specification (tech spec) is a document that describes how a software system will be built — covering: system architecture, database schema, API designs, user flows, acceptance criteria, security requirements, and technical constraints. A good technical specification is the foundation of a reliable fixed-price contract.

Technical-specification in the UK

Technical specifications are the primary output of ClickMasters' Technical Discovery phase. They serve multiple UK-specific purposes: enabling fixed-price contracts by defining scope precisely, satisfying UK GDPR Article 25 (privacy by design — the spec must document privacy controls), supporting Innovate UK grant applications (technical feasibility sections), and providing the audit trail required by UK regulators. For NHS software, technical specifications must reference FHIR R4 UK Core profiles and DTAC compliance requirements. ClickMasters technical specifications include: data model, API design (OpenAPI 3.0), UK GDPR privacy assessment, security architecture, and acceptance criteria for every user story.

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