Tcules begins with the operating pathway: the physical work, systems of record, roles, artefacts and exceptions. Product modelling establishes stable object identity and state names across field capture, coordination, portfolio views and integrations. Design then adapts the interaction to each environment without inventing a different truth for every device.
Mobile work prioritises rapid capture, legible status, offline behaviour and safe submission. Desktop work supports comparison, coordination and exception resolution. Field-context usability must account for glare, noise, movement, gloves and interrupted attention. Accessibility additionally requires semantic structure, operability and critical status that does not depend on colour alone.