  The Institute of Physics New Quantum Curriculum (quantumphysics.iop.org)
consists of online texts and interactive simulations with accompanying
activities for an introductory course in quantum mechanics starting from
two-level systems. Observation sessions and analysis of homework and survey
responses from in-class trials were used to optimize the simulations and
activities in terms of clarity, ease-of-use, promoting exploration,
sense-making and linking of multiple representations. This work led to
revisions of simulations and activities and general design principles which
have been incorporated wherever applicable. This article describes the
optimization of one of the simulation controls and the refinement of activities
to help students make direct connections between multiple representations.
