It became obvious that this type of research and development requires a lot of 
effort and above all the cooperation of productive organisations, in order to obtain 
the vast amount of statistical information necessary to derive significant models. 
The author must now confess, that due to reasons beyond.his control, not much 
further development of the research project could be achieved in the period between 
the Symposium of Comm. IV at Delft and the XII Congress of ISP at Ottawa. 
The ITC has moved its premises from Delft to Enschede and has had no access to a 
suitable computer in this period. The work on this project was thus only resumed 
early in 1972. 
The decision to present state of affairs to the Congress of ISP is governed by the 
following considerations and objectives: 
A discussion of the problem will contribute valuable ideas and information for 
the further development. It should furthermore assist in spreading the conviction 
of the necessity for a more systematic approach to planning and thereby increase 
the willingness of other organisations to contribute information and to 
participate in the development in future. 
1.2. Scope of the paper 
  
In addition to the foregoing historical review, a list of objectives will be 
presented which can hopefully be achieved by further research work. In paragraph 2, 
the second part of the above-mentioned Symposium paper, dealing with the problem 
of the analysis of the design of optimal procedures, will be presented again in 
a slightly revised form. This is intended for reference purposes only, as probably 
only à small number of congress participants are in the possession of ihe original 
paper. : 
Finally, in paragraph 3, a plan of operation for the further research work is 
developed, which should form a basis for the discussion and might possibly lead 
to decisions concerning the organisational aspects of the required cooperation of 
both research and production organisations. 
1.3. Objectives of research 
  
The problem analysis, which is only in a very general form at present, has to be 
worked out in more detail. Special attention has to be paid to the general 
establishment of the performance and cost models. Furthermore it will be necessary 
tó deal with the stochastic characteristics of the system and to develop means to 
incorporate them in the decision- and optimisation problem. 
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The object 
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to be more 
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