Norten's design articulates the membrane as porous spatial boundary.

Raphael Bousso came up with a modification that the spatial boundary should not be a trapped surface.

Teenagers use their cell phones as a way to negotiate spatial boundaries with their parents (Williams 2005:316).

Socio-ecological systems are complex and adaptive and delimited by spatial or functional boundaries surrounding particular ecosystems and their problem context.

For example, it may be possible to distinguish between spatial, technical and social boundaries.

If no common solution can be found neither team has the right to alter the other's design or re-define their own spatial boundaries.

Taskscape, then is a socially constructed space of human activity, understood as having spatial boundaries and delimitations for the purposes of analysis.

This brought about divisions along "confessional lines" that became reflected in new "spatial boundaries".

In multi-sited ethnography, research tracks a subject across spatial and temporal boundaries.

Common ways to define target populations that are central to the research design are by spatial boundaries, common cultures, or common work.