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Health economic evaluations are comparative analyses of alternative courses of action in terms of their costs and consequences. The Consolidated Health Economic Evaluation Reporting Standards (CHEERS) statement, published in 2013, was created to ensure health economic evaluations are identifiable, interpretable, and useful for decision making. It was intended as guidance to help authors report accurately which health interventions were being compared and in what context, how the evaluation was undertaken, what the findings were, and other details that may aid readers and reviewers in interpretation and use of the study. The new CHEERS 2022 statement replaces previous CHEERS reporting guidance. It reflects the need for guidance that can be more easily applied to all types of health economic evaluation, new methods and developments in the field, as well as the increased role of stakeholder involvement including patients and the public. It is also broadly applicable to any form of intervention intended to improve the health of individuals or the population, whether simple or complex, and without regard to context (such as health care, public health, education, social care, etc). This summary article presents the new CHEERS 2022 28-item checklist and recommendations for each item. The CHEERS 2022 statement is primarily intended for researchers reporting economic evaluations for peer reviewed journals as well as the peer reviewers and editors assessing them for publication. However, we anticipate familiarity with reporting requirements will be useful for analysts when planning studies. It may also be useful for health technology assessment bodies seeking guidance on reporting, as there is an increasing emphasis on transparency in decision making. Supplementary Information The online version contains supplementary material available at 10.1186/s12889-021-12491-0.

A validation-assessment tool is being developed for decision makers to transparently and consistently evaluate the validation status of different health-economic decision models. It is designed as a list of validation techniques covering all relevant aspects of model validation to be filled in by modelers, where they will indicate if and how each validation technique has been executed and what the outcomes were. It is then used by decision makers and their advisors to gain insight in the validation status of a model, without having to validate the model themselves. The tool is envisioned to be part of, for example, a submission dossier. The project purposely included experts from outside the health-economics field, in order to gain new insights. Starting from a gross list of validation techniques, the tool was developed using a Delphi panel of more than 50 international experts in several rounds. The workshop will start with an overview of the importance of model validation and the problems associated with it, such as consistency, transparency, and acceptability. Next, a first version of this tool will be shared, with a discussion on how it may help improve the model review process and support decision making. Next, we will actively invite audience members to add their own expertise by commenting on the draft tool. The workshop will finish with a discussion of the added value compared to other available instruments, among others the 2006 Phillips guidelines and the ISPOR Assessing Modeling Studies for Health Care Decisions Task Force.