Specification

A specification is a documented set of requirements that defines how a product, material, system, or process must perform or be executed. In industrial and manufacturing environments, specifications commonly describe technical parameters, materials, dimensions, tolerances, process steps, test methods, and acceptance criteria that must be met.

Specifications can apply to many areas, including product design, raw materials, equipment settings, cleanliness levels, packaging, labeling, data formats, and software behavior. They are typically controlled documents and form part of the basis for design, manufacturing, inspection, and release decisions.

How specifications are used in operations

In regulated industrial environments, specifications often:

• Define required characteristics for parts, assemblies, and finished goods (for example, dimensions, materials, performance limits).
• Describe process requirements, such as machine parameters, environmental conditions, and sequence of operations.
• Set quality and test requirements, including sampling plans, test methods, and pass/fail criteria.
• Govern data and documentation, such as formats for electronic records or required fields in batch records.
• Support integration across systems such as MES, ERP, and LIMS by standardizing identifiers and data attributes.

Specifications are usually linked to related documents like drawings, work instructions, standard operating procedures (SOPs), and material master records. In many plants, non-conformances are recorded whenever there is a departure from an approved specification.

Common types of specifications in manufacturing

• Product or part specification: Defines what a product or component must be, including physical, chemical, and functional requirements.
• Material specification: Defines requirements for raw materials, intermediates, and consumables, often including supplier and inspection criteria.
• Process specification: Defines how a process must be carried out, including equipment settings, sequences, and critical process parameters.
• Test or inspection specification: Defines how to verify requirements, including methods, instruments, sample sizes, and acceptance limits.
• Interface or data specification: Defines how systems or components communicate, including data structures, formats, and protocols.

Specification and compliance

In regulated sectors, specifications are typically under document control and version governance. Changes often require formal review, approval, impact assessment, and sometimes revalidation. Manufacturing execution systems, quality systems, and ERP platforms frequently reference specification identifiers to ensure that the current, approved version is applied in planning, production, and release decisions.

Common confusion

• Specification vs. standard: A standard is a broader, often externally published reference document. A specification is usually a concrete, organization-specific or product-specific set of requirements that may be based on one or more standards.
• Specification vs. work instruction: A specification defines what requirements must be met. A work instruction typically explains how operators should perform tasks to meet those requirements.
• Specification vs. drawing: A drawing may visually represent geometry and some requirements, while a specification usually provides a structured, often text-based definition of requirements. In many organizations the drawing and specification together form the complete requirement set.

Link to non-conformance management

Non-conformances in the workplace are often defined as any departure from an approved specification, requirement, procedure, or standard. Effective specification management supports traceability, investigation, and remediation when parts, processes, systems, or documentation do not meet approved specifications.