Structure of ISO 18025
The following clauses define this International Standard:
1. Scope defines the problem area that this International Standard addresses.
2. Normative references lists the normative references.
3. Definitions contains the glossary of terminology.
4. Concepts describes various fundamentals of this International Standard.
5. Environmental classifications describes classes used to describe environmental data.
6. Environmental attributes describes attributes used to describe environmental data.
7. Units specifies how the SI system of units and scale is applied to specify environmental data.
8. Organizational schemes defines a set of groups that are useful for locating classifications and attributes with similar meanings.
9. Conversions is a abstract specification of data types and functions to convert between values given in different units.
10. Conformance states requirements for conforming to this International Standard.
There are several annexes included in this International Standard:
A. Relationship with other coding systems tells how this International Standard relates to some other coding systems.
B. Bibliography lists the informative, non-standard topics referenced in this International Standard.
C. Associated units defines those units whose use is now deprecated.