ISO 5495-2005 amd1-2016 PDF

Full title and description

ISO 5495:2005 — Sensory analysis — Methodology — Paired comparison test, with Amendment 1 published in 2016 (designated ISO 5495:2005/Amd 1:2016). The amendment provides changes and clarifications that apply to the third edition (2005) of the paired comparison test methodology.

Abstract

Defines the paired comparison (directional difference / 2-AFC) sensory test used to determine whether a perceptible sensory difference exists between two samples for a given attribute, and to indicate the direction of any difference. The method is applicable when products are relatively homogeneous and is commonly used for difference detection, similarity checks, and assessor selection/training.

General information

• Status: Published (International Standard; amendment published).
• Publication date: Original: November 2005 (ISO 5495:2005); Amendment 1: February 2016 (ISO 5495:2005/Amd 1:2016).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 67.240 — Sensory analysis.
• Edition / version: Edition 3 (2005) with Amendment 1 (2016).
• Number of pages: Main standard: 21 pages; Amendment 1: 2 pages.

Key bibliographic and lifecycle details are recorded on the ISO catalogue and related standards catalogs.

Scope

Specifies a forced-choice paired comparison procedure for assessing whether a perceptible difference exists between two product samples with respect to one or more sensory attributes, and for indicating the direction of any detected difference. The procedure covers test formats, presentation of sample pairs, instructions to assessors, and interpretation of results; it does not quantify the magnitude of differences and is intended for relatively homogeneous products.

Key topics and requirements

• Definition and purpose of the paired comparison (2-AFC/directional difference) test.
• Test design: one-sided vs two-sided testing and selection of alternative hypotheses.
• Sample presentation rules for paired samples and randomization principles.
• Assessor instructions, answer forms and acceptable response recording.
• Statistical interpretation of results and decision criteria for perceptible difference vs similarity.
• Limitations and applicability (requires relatively homogeneous products; does not measure magnitude of difference).

(Topics and procedural requirements are specified in the standard and clarified by the 2016 amendment.)

Typical use and users

Used by sensory scientists, quality assurance and R&D teams in food & beverage, cosmetics, consumer goods and ingredient suppliers, independent sensory test laboratories, and academic researchers for difference testing, formulation changes, shelf-life or process comparisons, and assessor training/monitoring. National standards bodies and certification schemes may adopt or reference the method for regulatory or conformance testing.

Related standards

Related publications include other ISO sensory analysis methodology standards (for example general guidance on test room design, assessor selection and other difference tests such as duo-trio), and technical corrigenda/amendments associated with ISO 5495. Users often consult the broader ISO/TC 34/SC 12 family for complementary methods and guidance.

Keywords

paired comparison, 2-AFC, directional difference, sensory analysis, sensory testing, difference test, assessors, ISO 5495, amendment 2016, ISO/TC 34/SC 12.

FAQ

Q: What is this standard?

A: ISO 5495:2005 is an ISO international standard that defines the paired comparison sensory test procedure; ISO 5495:2005/Amd 1:2016 is Amendment 1 which updates or clarifies parts of the 2005 edition.

Q: What does it cover?

A: It covers the methodology for presenting paired samples to assessors, specifying test design (including one- and two-sided tests), assessor instructions, answer forms, randomization and the statistical interpretation needed to decide whether a perceptible difference exists and its direction. It does not provide a measure of difference magnitude.

Q: Who typically uses it?

A: Sensory evaluation practitioners in industry (food, beverage, cosmetics, consumer products), independent sensory labs, research organizations, and standards bodies use the test for difference detection, formulation comparison, and assessor training.

Q: Is it current or superseded?

A: The 2005 third edition remains the published edition with Amendment 1 issued in 2016; the ISO catalogue lists the 2005 edition and records the 2016 amendment as applied to that edition. Users should check the ISO catalogue or their national standards body for any later revisions or confirmations.

Q: Is it part of a series?

A: It is part of the ISO sensory analysis suite developed by ISO/TC 34/SC 12; related standards address test room design, assessor selection and other sensory test methods (e.g., duo-trio).

Q: What are the key keywords?

A: Paired comparison, 2-AFC, directional difference, sensory analysis, assessors, difference test, ISO 5495.