ISO/TS 8000-311:2012

Overview

ISO/TS 8000-311:2012 - "Data quality - Part 311: Guidance for the application of product data quality for shape (PDQ‑S)" provides guidance for applying product data quality principles specifically to three‑dimensional shape data as described in ISO 10303‑59. It is part of the ISO 8000 product data quality series and explains how to describe, check, declare and improve the quality of product shape data used across CAD/CAM/PLM and manufacturing processes.

Key topics and requirements

• Scope and definitions: precise terms for product data, product shape data, quality criteria, thresholds, inspection and measurement requirements.
• PDQ‑S schema structure: guidance on the structure and relationship of PDQ‑S schemas to product model schemas (see Figures and schema diagrams in the document).
• Target shape model: how PDQ‑S targets nominal shape representations (B‑rep and related models) for quality assessment.
• Quality criteria for 3D shape data: classification of shape data quality issues and criteria used for checking (accuracy, erroneous_data, short/long edge, gaps, self‑intersections, etc.).
• Conformance and usage methods: two supported methods for applying PDQ‑S, procedures to modify existing Application Protocols (APs) for PDQ‑S conformance, and recommended steps to promote PDQ activities.
• Interaction with checking and healing systems: PDQ‑S as an enabler for standardizing external specifications of quality‑checking algorithms and improved association between checking and data‑healing tools.
• Extensibility and examples: example instantiations, usage scenarios (exchange, assembly, die development) and annexes comparing related specifications.

Practical applications

• Ensuring reliable CAD model exchange between OEMs, suppliers and subcontractors.
• Defining measurable product data quality requirements for digital manufacturing, digital assembly and collaborative engineering.
• Automating and standardizing quality checks in PLM workflows and CAX pipelines.
• Guiding development of PDQ checking and healing tools to produce interoperable quality reports and corrective actions.

Who should use this standard

• CAD/CAM/CAE and PLM software vendors implementing PDQ checks and data exchange.
• Manufacturing engineers, CAD modelers and quality engineers responsible for model readiness for downstream processes.
• Suppliers and OEMs defining contractual data quality requirements for part and assembly geometry.
• Standards developers and integrators aligning application protocols with ISO 10303 (STEP).

Related standards

• ISO 10303‑59 (target representation for PDQ‑S)
• ISO/TS 8000 series (product data quality framework) and ISO/TS 8000‑1
• Comparison material with ISO/PAS 26183 (see Annex C)

Keywords: ISO/TS 8000‑311:2012, PDQ‑S, product data quality for shape, ISO 10303‑59, CAD data quality, PLM, shape data validation.