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[Correspondence] Systems modelling tools to support policy and planning

In their Viewpoint, Harry Rutter and colleagues (Dec 9, 2017, p 2602)1 make another welcomed call for increased uptake and investment in systems modelling tools to provide evidence better suited to addressing complex public health problems. We note the authors’ assessment that systems modelling tools and approaches are “rarely operationalised in ways that generate relevant evidence” to support public health policy and practice. We disagree with this assessment and provide a broader perspective to show the efforts and progress in using systems modelling tools to support complex public health problems.