Design Factors for Evaluating Child Resistant Packaging

"Two novel designs for child resistant closures are tested.~One is sized based on the anthropometric properties of adults and children's hands such that it should disallow children from engaging the system and enable adults (the physically based design strategy). The other replicates the first design, but is sized such that either of the two populations should be able to engage the closure.~In testing this way, we begin to differentiate the paradigm that holds the children out (the cognitively based design strategy-- they do not understand and/or a physical one- they are unable to use the closure).~Results (proportion of children opening within the first or second five minute periods of test and time to opening during the same) from each of these, will be compared to results from the third treatment, a standard, commercially available push and turn system."