Project Blue Book Special Report No. 14 (Analysis of Reports of Unidentified Aerial Objects)

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SINGLE OBSERVATION - A SIGHTING consisting of a single
report from ( 1) one OBSERVER with no knowledge
of additional OBSERVERS of the same phenom­
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enon, or (2) a group of witnesses of the same
phenomenon, each cognizant of the others. The
witness who made the report is called a SINGLE
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OBSERVER.
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MULTIPLE OBSERVATION -
A SIGHTING consisting of
several reports from OBSERVERS of the same
phenomenon who were cognizant of each other.
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The witnesses who made reports are called
MULTIPLE OBSERVERS.
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ALL SIGHTINGS -
( 1) The group of reports consisting of one
report for each OBSERVER, including both
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SINGLE and MULTIPLE OBSERVERS. (2) The
questionnaire, work sheet, and IBM card
representing the report from each OBSERVER -
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in other words, the representation of each report
accepted for the statistical study.
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UNIT SIGHTINGS -
( 1) The group of reports consisting of one
report for each SIGHTING, including all the
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reports of SINGLE OBSERVATIONS and the one
most representative report from each MULTIPLE
OBSERVATION.
(2) The questionnaire, work
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sheet, and IBM card representing the report for
each SIGHTING accepted for the statistical study.
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A major serial number (four digits) was assigned to each sighting,
segregating the year of occurrence by selection of limits for each year, as
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follows:
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0001 to 0500 reserved for 1947
0501 to 1000 reserved for 1948
1001 to 1500 reserved for 1949
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150lto2000 reserved for 1950
2001 to 2500 reserved for 1951
2501 to4900 reserved for 1952
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While this scheme would serve to identify any individual sighting, identifi­
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cation of each report and its subsequent forms was necessary.
The minor
subserial numbers (two digits) fulfiiled this requirement. For all SINGLE
OBSERVATIONS, a major serial number followed by two (2) zeros, for
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example, 2759. 00, was sufficient identification. For MULTIPLE OBSER­
VATIONS, the major serial number followed by a series of two-digit num­
bers ranging from 00 to 99 was used to identify the individual reports. In
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general, the most complete report from the most reliable observer of that
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