Glossary

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Elasticity

For an as-a-Service layer, elasticity is the degree to which the layer is able to adapt to workload changes by (de)provisioning services of its underlying layers in an autonomic manner such that at each point in time the utilised services fulfill the SLA of the layer as closely as possible.

SaaS Stakeholder

Example SaaS stakeholders: SaaS End-users, SaaS provider, SaaS Architects, SaaS Developers, SaaS Deployers (work on PaaS/IaaS layer!), SaaS Maintainer, SaaS *Anyone*

Scalability

For an as-a-Service layer, scalability is the ability of the layer to sustain increasing workloads while fulfilling its SLA, potentially by exploiting a higher quantity of lower layer services.

For the Software-as-a-Service layer, scalability is the ability of the software to sustain increasing workloads while fulfilling its SLA, potentially by exploiting a higher quantity of PaaS or IaaS services.