Rational idealized linear engineering design (RILED) models, with homogeneous work stages, still underpin much HCI research and practice. Human-centred activities dominate stages corresponding to engineering's problem analysis and validation/ verification, while other work stages receive less attention (e.g., requirements specification, progressive detailing of design). This juried alt.chi paper argues for parallel design work with heterogeneous episodes that can be design-led, human-centred, strategy-driven or evaluation-based, or a mix of some or all of these. To support this. it motivates and develops a vocabulary to replace RILED's lexicon of stage, iteration, problem, solution, implications, requirements, and validity.