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are to be established than if the production standards are to be used for 
comparative evaluation, as is the case in process optimisation or decision- 
making in the purchase of new equipment or acceptance of new methods. 
This is because the task of process optimisation requires, in the first place, 
the derivation of the economic consequence of changes in a number of process 
parameters. 
The main consequence of having production standards applicable also 
to projects executed in other circumstances is the fact that much more data 
will be required for their derivation, and the standards themselves will have to 
be compatible. The collection of the practical experience presently available 
in individual organisations, the representation of this experience in a suitable 
form, and, if necessary, its calibration to suit other circumstances, is obviously 
a task which can only be achieved by a co-operative effort and when interested 
organisations are agreed as to the theoretical models to be used in the standar- 
disation process. 
In the conviction that the potential benefits of such an undertaking 
would richly repay the effort spent thereon, the author would like to appeal 
to photogrammetric organisations for their co-operation in this project. 
Acknowledgement 
The author wishes to acknowledge gratefully the assistance received 
from Drs. A.D.J. Schaap with the economic models, and, in particular, the 
aspects of social costs, and from Mr. J. Kure for his co-operation in the 
writing of this paper.