Vertical Slicing — split any spec into shippable iterations

ACTIVATE whenever a functional spec, user story, Jira US, GitHub issue or feature request has to be broken into iterations, slices, tickets or steps — including any planning where you are about to write a list of iterations. ACTIVATE for 'découper', 'split this story', 'too big', 'vertical slicing', 'horizontal slicing', 'INVEST', 'SPIDR', 'iterations', 'MVP first', 'what do we build first', 'this story cannot be split'. Provides 17 splitting techniques, a selection procedure that picks and combines them from the feature's real axis of complexity, the technical constraints and the execution mode (human review vs autonomous agent), plus the anti-patterns that produce fake …