  We investigate the properties and relations of two classes of operational
bipartite and multipartite entanglement measures, the so-called source and the
accessible entanglement. The former measures how easy it is to generate a given
state via local operations and classical communication (LOCC) from some other
state, whereas the latter measures the potentiality of a state to be
convertible to other states via LOCC. Main emphasis is put on the bipartite
pure states, single copy regime. We investigate which parameter regime is
physically available, i.e for which values of these measures does there exist a
bipartite pure state. Moreover, we determine, given some state, which parameter
regime can be accessed by it and from which parameter regime it can be
accessed. We show that this regime can be determined analytically using the
Postitivstellensatz. Moreover, we compute the boundaries of these sets and the
boundaries of the corresponding source and accessible sets. Furthermore, we
relate these results to other entanglement measures and compare their
behaviors. Apart from that, an operational characterization of bipartite pure
state entanglement is presented.
