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Instability predictions are important in sheet-metal forming processes, one such instability being splitting failures due to localized necking. The majority of such sheet-metal industrial splitting failures occur near to the plane-strain state. Therefore, sheet-metal industries have always been looking for an “ideal” formability test which allows them to evaluate sheets for their ability to resist splitting failures under near plane-strain conditions. Several formability tests have been developed in the past but none have been very successful. Presently, a new test has been designed, constructed and used to evaluate the formability of different sheet materials. The results from this new test are compared with standard limiting-dome-height (LDH) tests and finite-element simulations. The results show that the new test is more reproducible, more closely follows the desirable plane strain path and takes roughly 1 6 of the time to perform …