One argument against incomplete acquisition is that the input that heritage speakers receive is different from monolinguals (the input may be affected by cross-generational attrition, among other factors), thus the comparison of heritage speakers against monolinguals is weak. This argument by Pascual and Rothman claims that the acquisition of the heritage language is therefore not incomplete, but complete and simply different from monolingual acquisition of a language. Another argument argues for a shift in focus on the result of incomplete acquisition of a heritage language to the process of heritage language acquisition. In this argument, the crucial factor in changes to heritage language acquisition is the extent to which the heritage speaker activates and processes the heritage language. This new model thus moves away from language acquisition that is dependent on the exposure to input of the language and moves towards dependence on the frequency of processing for production and comprehension of the heritage language.