https://en.wikipedia.org/wiki/Specification_(technical_standard)
Sometimes a guide or a standard operating procedure is available to help write and format a good specification.[3][4][5] A specification might include:
Descriptive title, number, identifier, etc. of the specification
Date of last effective revision and revision designation
A logo or trademark to indicate the document copyright, ownership and origin[6]
Table of Contents (TOC), if the document is long
Person, office, or agency responsible for questions on the specification, updates, and deviations.
The significance, scope or importance of the specification and its intended use.
Terminology, definitions and abbreviations to clarify the meanings of the specification[7][8]
Test methods for measuring all specified characteristics
Material requirements: physical, mechanical, electrical, chemical, etc. Targets and tolerances.
Acceptance testing, including Performance testing requirements. Targets and tolerances.
Workmanship
Certifications required.
Safety considerations and requirements
Environmental considerations and requirements
Quality control requirements, acceptance sampling, inspections, acceptance criteria
Person, office, or agency responsible for enforcement of the specification.
Completion and delivery.
Provisions for rejection, reinspection, rehearing, corrective measures
References and citations for which any instructions in the content maybe required to fulfill the traceability and clarity of the document[8][9][10]
Signatures of approval, if necessary[11]
Change record to summarize the chronological development, revision and completion if the document is to be circulated internally[12]
Annexes and Appendices that are expand details, add clarification, or offer options.[12]