The *(term) for an implementation that can be _(dynamic)ally (at run-time or otherwise post facto) evolved, customized, modified, etc.

See <a href="http://www.parc.xerox.com/csl/groups/sda/projects/oi/default.html">Open Implementation</a> at _(Xerox PARC), with many great papers on the topic, which led to include _(aspect-oriented programming), and so covers that as well.