A traditional, single-purpose composition is often configured in a two-tier hierarchy, with all of the composition logic residing in the parent task service. Alternatively, the composition can be structured into additional tiers so that the composition is comprised of a parent controller service and one or more nested compositions represented by sub-controller services. These nested compositions may be necessary to carry out the parent task, but individually they can also provide logic that can be used independently to automate a smaller task, or they may have logic that can be used to automate other larger tasks. Either way, they can be structured to represent and abstract agnostic logic for reuse purposes.