Design and analysis of stepped wedge cluster randomized trials.

By Michael A. Hussey, James P. Hughes. Contemporary Clinical Trials, 2007

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Selecting and Improving Quasi-Experimental Designs in Effectiveness and Implementation Research (2018, background): “Stepped wedge designs (SWDs) involve a sequential roll-out of an intervention to participants (individuals or clusters) over several distinct time periods (5, 7, 22, 24, 29, 30, 38).”
The stepped wedge cluster randomised trial: rationale, design, analysis, and reporting (2015, methodology): “The example uses the method of Hussey and Hughes 4 13 and refers to a trial with 20 clusters and total cluster size of 50 designed to detect a standardised effect size of 0.3 (at 5% significance).”
An introduction to implementation science for the non-specialist (2015, methodology): “Additional innovative designs have been employed, such as stepped wedge designs in which all participating sites receive implementation support, though staggered in time [54, 55], resembling traditional incomplete block designs.”
Experimental and Quasi-Experimental Designs in Implementation Research (2019, background): “In a stepped wedge, all participants receive the intervention, but are assigned to the timing of the intervention in a staggered fashion (Betran et al., 2018; Brown and Lilford, 2006; Hussey and Hughes, 2007), ty-”