We review several decision models to derive six fundamental requirements to
collaborative spatial decision-making: perceiving changes in spatial data;
retaining interpretation mindsets; externalizing actions and expectancies in
spatial data; organizing divergent and convergent working modes; supporting the
recognition of situation-action elements; and managing task/pattern structures.
A review of the current state of the art shows limited support to some of these
requirements, in particular task/pattern and divergent/convergent support. An
e-planning prototype was developed to demonstrate the impact of these
requirements in collaborative spatial decision-making. Results from a
preliminary experiment indicate the prototype enables people to contribute,
explain, exteriorize and share their ideas in relation with spatial references