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the reasoning should be possible with and without 
the membership hierarchy. 
In addition to the above to be investigated 
bottleneck problems several other technical 
problems need to be studied yet, before a complete 
workable system can be created: 
- extend the description structure to handle more 
spatial or topologic relations, in order to model 
various objects in 2-D or 3-D space. 
- establish the interface to GIS, although the 
conception itself can also be considered as a 
integrated GIS model. 
- explain results by using information in the KB and 
DB. 
- seperate implicit domain-dependent 
knowledge( procedures or rules) from reasoning 
operations, formulte it modularly in terms of 
individual functions, so that a blackboard system 
can be completed. 
- handle huge data amount through skilled 
programming, e.g. using a bit for representation of 
States, storage space mapping and allocation 
techniques etc. 
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