ons 
ype 
the 
be 
Ser 
the 
77 
iis 
the 
ree 
red 
to 
Lon 
any 
[MP 
le, 
lit 
ACKNOWLEDGEMENTS 
I would like to acknowledge the efforts of everyone at PCI who has been 
responsible for the concept, design and implementation of EASI/IMP and PACE, 
and especially Berne Grush, Martin Ojaste and Dave Stanley. The National 
Research Council of Canada and the Canada Centre of Remote Sensing provided 
financial assistance through the PILP program for the original development 
efforts. Finally, I would like to thank David Harris for his valuable 
assistance in editing the manuscript. 
REFERENCES 
Morland, D.V. (1985) "The Evolution of Software Architecture", DATAMATION, 
February 1, 1985, pp. 123-132 
Clements, P., Parnas, D. and Weiss, D. (1983) "Enhancing Reusability with 
Information Hiding", Proc. Workshop Reusability in Program., Sept. 1983, 
pp. 240-247 
601