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4.6    Planning
In order to ensure the timely publication of a 3GPP TS or 3GPP TR or of a series of associated 3GPP TSs or 3GPP TRs, the intended structure and any interrelationships shall be established before detailed drafting begins. In particular, consideration shall be given to the subdivision of the subject matter (see subclause 5.1). In the case of a multi-part 3GPP TS or 3GPP TR, a list of the intended parts together with their titles shall be drawn up. The rules given in the present document shall be applied from the very beginning of the work and throughout all subsequent stages to avoid delay at any stage.

4.7    (void)
5    Structure
5.1    Subdivision of the subject matter
5.1.1    General

3GPP TSs or 3GPP TRs are so diverse that no universally acceptable rules can be established for the subdivision of the subject matter.
However, as a general rule, an individual 3GPP TS or 3GPP TR shall be prepared for each subject to be standardized, and published as a complete entity. In specific cases and for practical reasons, for example:
-    the 3GPP TS or 3GPP TR is likely to become too voluminous;
-    subsequent portions of the content are interlinked;

-    portions of the 3GPP TS or 3GPP TR could be referred to in regulations; or
-    portions of the 3GPP TS or 3GPP TR are intended to serve for certification purposes,
the 3GPP TS or 3GPP TR may be split into separate parts under the same number. This has the advantage that each part can be changed separately when the need arises.
In particular, the aspects of a product which will be of separate interest to different parties (e.g. manufacturers, operators, certification bodies, legislative bodies) shall be clearly distinguished, preferably as parts of a 3GPP TS or 3GPP TR or as separate 3GPP TSs or 3GPP TRs.
Such individual aspects are, for example:

-    performance requirements;
-    maintenance and service requirements; and
-    quality assessment.
The terms that shall be used to designate the divisions and subdivisions that a 3GPP TS or 3GPP TR may have are shown in table 1.

Table 1: Names of divisions and subdivisions
Term    Example of numbering
part
clause
subclause
subclause
annex
clause
subclause    3GPP TS 21.299-1
1
1.1
1.1.1
A
A.1
A.1.1

5.1.2    Subdivision of the subject matter within a series of parts
There are two systems in use for subdividing into parts:
a)    Each part deals with a specific aspect of the subject and can stand alone.
b)    There are both common and specific aspects to the subject. The common aspects shall be given in part 1. Specific aspects (which may modify or supplement the common aspects and therefore cannot stand alone) shall be given in individual parts.

Where the system described in b) is used, care shall be taken that the references from one part to another are always to the latest version. There are two ways to achieve this:
-    If reference is made to a particular element, the reference shall be specific (see subclause 6.6.6.5.2).
-    Since the complete series of parts is normally under the control of the same TSG, the use of non-specific references (see subclause 6.6.6.5.3) is permitted, provided that corresponding changes are implemented simultaneously in all parts.

The use of non-specific references requires a high degree of discipline by the TSG responsible for the 3GPP TS or 3GPP TR.
Their use is not permitted between 3GPP TSs or 3GPP TRs of different Technical Bodies except where the reference is intentionally non-specific, i.e. it is accepted that it will be possible to use all future changes of the text referred to for the purposes of the referring 3GPP TS or 3GPP TR.
Each part of a multi-part 3GPP TS or 3GPP TR shall be drafted in accordance with the rules for an individual 3GPP TS or 3GPP TR as specified in the present document.

5.1.3    Subdivision of the subject matter within an individual 3GPP TS or 3GPP TR
Table 2: Example of a typical arrangement of elements in a 3GPP TS or 3GPP TR