Target application architecture:
Multiple back end components with 3 x customer front end (WEB, Android, iOS) and 1 business front end (IACT)
A release will consist of a collection of per component releases
Component release candidates (especially backend) are released to test somewhat haphazardly, so overlapping releases during testing
Most requirements require releases across multiple components, also applies to some defects.
Defects can be distinct to a component, common to all front end clients