Guidelines for Recording Holdings: Gaps and Nongap Breaks

Level 3 - Gaps are only recorded when a unit at the highest level of enumeration or chronology is missing.
Level 4 - (Mandatory) - Gaps are record when any unit is missing.
A gap is a break in the holdings of the published parts of a multipart unit or serial unit.
A nongap break is a break in the holdings of a multipart unit or serial unit caused by unpublished parts or discontinuity in the publisher's sequential designations. Frequency changes are not considered nongap breaks. Gaps - Level 3 | Gaps - Level 4 | Nongap Breaks - Level 3 | Nongap Breaks - Level 4
Gaps - Level 3
- If no issues of a volume are held, record the gap.
```
If no issues of volume 3 are held:
v.1(1950)-v.2(1951),
v.4(1953)-v.8(1957)
```
- If some issues of a volume are held, do not record the gap.
```
If any issue of volume 3 is held:
v.1(1950)-v.8(1957)
```
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Gaps - Level 4
- If no issues of a volume are held, record the gap.
```
v.1(1950)-v.2(1951),
v.4(1953)-v.6(1955)
```
- If some issues of a volume or the entire volume are held, record the gap.
```
v.7:no.1(1956:Feb.)-v.7:no.2(1956:Apr.),
v.8(1957)
```
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Nongap Breaks - Level 3
- If a complete volume is not published, record the gap because it is at the highest level.
```
Volume 3 was never published:
v.1(1950)-v.2(1951);
v.4(1953)-v.8(1957)
```
- If an issue of a volume is not published, do not record the gap.
```
If the spring issue of volume 3 is not published:
v.1(1950)-v.8(1957)
```
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Nongap Breaks - Level 4
- If a complete volume is not published, record the nongap break.
```
Volume 3 was never published:
v.1(1950)-v.2(1951);
v.4(1953)-v.6(1955)
```
- If an issue of a volume is not published, record the nongap break.
```
No more issues for volume 7 were published:
v.7:no.1(1956:Feb.)-v.7:no.2(1956:Apr.);
v.8(1957)
```
- If the publisher changes enumeration or chronology, record the nongap break.
```
Publisher switches from volume and year to annual editions:

v.1(1993)-v.3(1995);
1996 ed.
```
- If the publisher introduces a new series, record the nongap break.
```
Publisher introduces Series 2:

ser.1:v.1(1985)-ser.1:v.10(1994);
ser.2:v.1(1995)-ser.2:v.2(1996)
```
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