Managing Service Level Agreement (SLA) within a cloud-based system is important to maintain service continuity and improve trust due to cloud flexibility and scalability. We conduct a general review on cloudbased systems to understand how service continuity and trust are addressed in cloud SLA management. The review shows that SLA renegotiation is necessary to improve trust andmaintain service continuity; however, research on SLA renegotiation is limited. Of the two key approaches in renegotiation, namely bargainingbased negotiation and offer generation-based negotiation, the latter approach is the most promising due to its ability to generate optimized multiple-offer SLA parameters within one round during renegotiation. © 2015 ACM.