A working Participatory 3D Model is never completed.
Like in
any dynamic system, change is a constant.
Although a relief model, like GIS, can accommodate regular
up-dating,
it cannot memorize past scenarios.
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This is where GIS "adds value" and becomes a
vital
ingredient
for monitoring change.

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A P3-D model can be instrumental to conducting Participatory
Monitoring and Evaluation (PM&E) provided the data are up-dated
at given intervals, periodically extracted, digitized, plotted in
GIS thematic maps and finally returned to the community for
assessing change, and identifying its causes and effects.
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