This document describes the LISA (Linked Slow-Start Algorithm) for  Multipath TCP (MPTCP). Currently during slow-start, subflows behave like independent TCP flows making MPTCP behave unfairly to cross-traffic and causing more congestion in the bottleneck, which yields more losses among the MPTCP subflows. LISA couples the initial windows (IW) of MPTCP subflows during the initial slow-start phase to remove this adverse behavior.