Classification systems in the library

Information about the classification systems used in the NTNU University Library. The library uses different classification systems because our collections consist of books and documents from three different libraries.

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All the libraries at Gløshaugen use UDC (Universal Decimal Classification). UDC is designed for subjects and topics in technology.

UDC is divided into 10 main classes:

0: Science and Knowledge, Organization, Computer Science, Information Science, Documentation, Librarianship, Institutions, Publications

1: Philosophy, Psychology, Ethics

2: Religion, Theology

3: Social Sciences

4: vacant

5: Mathematics, Natural Sciences

6: Medicine, Technology; includes Civil Engineering and Design

7: The Arts, Architecture, Sport; includes Architecture and Design

8: Linguistics, Literature

9: Geography, Biography, History

Each main class can be further divided into ten sub-classes, which can be further divided into ten sub-classes, which can be further divided into ten sub-classes. This system can result in long numbers; to make the longer numbers easier to read, an auxiliary sign is inserted after every third digit. In the UDC system we use different auxiliary signs to describe complex subjects; the auxiliary signs need to appear in a certain order.

Architecture- and Civil Engineering Library #

UDC class 6 - Medicine and Technology #

61: Medical Sciences

62: Engineering

63: Agriculture

64: Home economics

65: Business management

66: Chemical industries

67: Various industries

68: Industries

69: Building practice and procedure

The most important UDC numbers for engineering literature #

624: Civil and structural engineering in general

624.04: Building statics

624.07: Building design

624.2/.8: Bridge construction

625.1/.5: Railway engineering

625.7/.8: Highway engineering

628: Public health engineering. Water. Sanitation. Illuminating engineering

628.1: Water supply

628.3: Sewage

628.4: Urban hygiene

628.5: Measures against industrial and other nuisances

69: Building (construction) trade. Building materials. Building practice and procedure.

69.00: Building administration

69.059: Building damages

691: Building materials

691.1: Organic materials

691.2: Building stones

691.3: Concrete

691.4: Ceramic materials

691.6: Glass

691.7: Metallic materials

692: Structural parts and elements of buildings

692.2: Walls

692.4: Roofs and roofing

692.5: Floors

692.6: Stairs

692.8: Doors, windows

694: Timber construction. Carpentry. Joinery.

696: Sanitary installations

697: Heating, ventilation

699.8: Isolation

UDK class 7 - The Arts. Recreation. Entertainment. Sports #

71: Physical planning

72: Architecture

73: Plastic arts

74: Drawing. Design. Applied arts and crafts

75: Painting

76: Graphic art

77: Photography

78: Music

79: Recreation. Entertainment. Games. Sport.

The most important UDC numbers for literature in architecture and planning #

7: Art

7.01: Theory and philosophy of art

7.03: Artistic periods and phases

7.05: Applications of art

711: Principles and practice of physical planning

711.2: Province planning

711.3: Municipality planning

711.4: Town planning

712: Planning of landscape

712:2: Horticulture

72: Architecture

72.01: Theory and philosophy of architecture

72.03: Periods and phases of architecture

725: Public, civil, commercial, industrial buildings

728: Domestic architecture

73: Plastic arts

74: Drawing. Design. Applied arts and crafts

745.2: Industrial design

749: Artistic furniture, heating and lighting devices

75: Painting

76: Graphic art. Printmaking. Graphics

766: Applied graphic arts. Commercial graphics

77: Photography and similar processes

778:72: Architecture photography

79: Entertainment

792: Theatre

792.021: Scenography

UDC - industrial design #

The library uses industrial design as label for subjects within design and product design. More than one UDC class will be relevant for those who study or do research in this field, depending on the main focus of study. Literature bought for industrial design, or where industrial design is an essential part of the content, will be tagged with a design number in addition to the main subject number.

UDC numbers relevant in design #

331.101.1: Ergonomics

65.015.11: Man and machine

658.624: Product development

658.626: Branded products (branding)

659.126: Trademarks (design)

7.011: Design (theory)

7.05: Design

7.05(092): Designers

745.2: Industrial design

745.2.02: Product development (design)

745.2.023: Materials (industrial design)

745.2.03: Industrial design (history)


Dragvoll Library, Gunnerus Library, Fine Arts Library, Music Library, Teacher Training Library Moholt, Gjøvik Library and Ålesund Library use Dewey Decimal Classification (DDC). DDC is another system for classification of books in the library. DDC is, like UDC, also divided into ten main classes:

000: Computer science, information and general works

100: Philosophy and psychology

200: Religion

300: Social sciences

400: Language

500: Science

600: Technology

700: Arts and recreation

800: Literature

900: History and geography


The library of Medicine and Health uses NLM to organise its collections. NLM is a classification system developed at the United States National Library of Medicine. NLM’s categorisation is based on letters, not numbers.

Preclinical Sciences #

QS: Human Anatomy

QT: Physiology

QU: Biochemistry

QV: Pharmacology

QW: Microbiology & Immunology

QX: Parasitology

QY: Clinical Pathology

QZ: Pathology

Medicine and Related Subjects #

W: Health Professions

WA: Public Health

WB: Practice of Medicine

WC: Communicable Diseases

WD: Disorders of Systemic, Metabolic, or Environmental Origin, etc.

WE: Musculoskeletal System

WF: Respiratory System

WG: Cardiovascular System

WH: Hemic and Lymphatic Systems

WI: Digestive System

WJ: Urogenital System

WK: Endocrine System

WL: Nervous System

WM: Psychiatry

WN: Radiology. Diagnostic Imaging

WO: Surgery

WP: Gynecology

WQ: Obstetrics

WR: Dermatology

WS: Pediatrics

WT: Geriatrics. Chronic Disease

WU: Dentistry. Oral Surgery

WV: Otolaryngology

WW: Ophthalmology

WX: Hospitals & Other Health Facilities

WY: Nursing

WZ: History of Medicine

Music classification #

To organise notes, the Music Library uses a foreign classification system that was first used to organise the music collection in the Deichman Library. Now it’s also used by the Norwegian Academy of Music and the music conservatory libraries. The system has local varieties. The classification is built up by sorting instruments and groups of instruments. This means that e.g. all violin notes are organised and stored together. Scores do not follow the same classification. Grand scores, student scores and piano scores are treated as separate classes.


One sonata (one composer) for the flute and the piano is labelled: H 1111.

A collection of musical pieces (several composers) only for the flute is labelled: H 1102.

A collection of duets for two violins (one composer) is labelled: F 100

Two viola: F 101

Two celli: F 102

Song books are labelled R 6, while children’s song books are labelled R 61

Main classes #

C - Keyboard instrument

D - Organ and harmonium

E - Stringed instruments

F - Chamber music for stringed instruments

G - Chamber music with piano or basso continuo

H - Wind instruments

K - Chamber music for wind instruments

L - Harmonica instruments

M - Stringed instruments + Electrical stringed instruments

N - Chamber music for mixed orchestra without piano / basso continuo

O - Percussion

P - Methodical music material

Q - Mechanical and electronical instruments

R - Special kinds of music (e.g. folk music, church music, song books)

S - Songs for single voice

T - Choir

U - Piano scores

V - Scores

X - Materials for orchestra

Y - Collected works and selected edition

Z - Series and anthologies

Æ - Manuscripts

Contact #

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