 Eschewing a more formal analysis, some definitions (including the “distress-impairment” analyses introduced earlier), rely on prototypical cases (see Graham 2010, for example). Others are more ambitious, proposing analytic definitions in terms of necessary and sufficient conditions. Some are intended to cover other medical conditions as well as mental disorders. (For those stressing the inseparability and interdependence of mental and bodily disorder, no important distinction is acknowledged between mental and physical disorders [Pârvan 2015].) (i)–(iv) below are a sample of these efforts.