Working-memory practice built on the span tasks used in cognitive assessment — forward and backward digit spans, letter and word lists, and serial-order recall. You hold a sequence, it disappears, and you answer from memory; difficulty scales with how much there is to hold, whether order matters, and where in the list the probe falls. Every explanation teaches a repeatable encoding strategy — chunking, rehearsal, and grouping — so the span grows with practice. Distinct from Observation & Memory (recalling details from a described scene): this is sequence recall. Skill practice, never an intelligence measure.