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Greg;
There are some fundamental differences
in the way that VistA looks at data and more traditional systems look at
data. The reaon that VistA has been so successful is that each new
application has added color and aditional depth to the corporate data model for
the applications being built and evolved. So many of the new applications
are actually orthogonal to the previous application. The earlier
applications are not necessarily tied to the later developed applications which
are built upon them. The new data structures don't necessarily need
to interfer with the form and function of the original applications.
Are there dependencies established with the earlier application for the newer
applications? Perhaps, if the developer doesn't understand the full
_expression_ of the applications they are using as base assumptions for their new
model. But at least they had that existing framework to hang their models
on and that jumped their design from concept into a working model in short
order. Now that seems too short cut for good software development.
Possibly true, but it is good enough to get the model into the hands of the
folks who have to live with it and use it every day.
Now this provides a model which can go
through many of the iteritive steps of development very quickly without having
to go through the laborious and costly effort of capturing enough of the
specification to build the next release (many months and man-hours away).
Not only that but this type of rapid prototyping can happen in a number of
places at the same time. The best solution frequently is some where in the
midle of all of these development efforts. And in some cases, the solution
is only of value to the people of this one facility.
The goal is to provide a mechanism which is
orthogonal to the code enhancement path so that the localizations are not
overwritten. WorldVistA will be providing guidelines for how this can be
done without fear of being overwritten by centrally released enhancements in the
future. If these enhancements can be brought back to WorldVistA, we will
be working these enhancements into the main code base as standard release if
they are considered to be useful and desired by the general
population.
Best wishes;
Chris
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