3 teams of 3 men each were told to work together on the performance 
measures and to report only those targets on which two or more of them 
agreed. Following this procedure, there was no decrease in number of 
Wrong responses as was evidenced in the previously cited results of 
pooling independent judgments. Such factors as suggestion and reluc- 
tance to disagree with one's teammates may be operating here. In this 
regard future studies conéidering means of improving team procedures 
will be of considerable interest, especially where both officers and 
enlisted men are involved. 
In order to get some indication of the effects of increasing the 
length of time in actual photointerpretation, three of the five tactical 
tests were administered to some photointerpreters in the second class of 
enlisted men, with time limits twice that allowed the first class. Most 
examinees finished well before the time limits had expired. 
no evidence that the average number of cor 
but there was some evidence that there may be an increase in the average 
number of errors with increased time. This suggests that there may be 
an optimum viewing time for certain types of photographs which is long 
enough for critical targets to be identified but not so excessively 
long as to encourage the "seeing" of imaginary targets. 
There was 
rect identifications increased, 
It cannot be overemphasized that the results obtained so far by 
the Image Interpretation Tusk of the Personnel Research Branch are of 
an extremely tentative nature. They are based on small and restricted 
samples of photointerpreters, and on experimental performance measures. 
The real difficulty, if not impossibility, of producing in any artifi- 
cial test situation the on-the-job conditions under which photointer- 
preters will work in actual war-time, should also be pointed out. For 
this reason, real photographs taken of enemy pesitions in war-time are 
used as much as possible. However, the data obtained so far do point 
out the extreme difficulties involved in interpreting tactical photo- 
&raphs, and the possible fruitfulness of human factors research in 
. photointerpreter selection, assignment, work procedures and methods, 
group interactions, and systems operations. A major research effort 
1s needed for existing surveillance systems as well as for the new 
sensor systems currently being developed. 
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