d="para0001">A computationally efficient, asymptotically optimal heuristic.
dd><dt class="label">•dt><dd>d="para0002">An asymptotically tight lower bound.
dd><dt class="label">•dt><dd>d="para0003">A new, hybrid approach containing the system and item approach, as special cases.
dd><dt class="label">•dt><dd>d="para0004">Sequential procedure performs poorly for multi-item systems.
dd>dl>