At the end of the five predicables, three decisions should be clear:
1. Inside or outside essence? Genus, species and differentia belong to the intrinsic account; property and common accident are extrinsic.
2. If extrinsic, peculiar or shared? A property is peculiar to one species; a common accident applies across species.
3. If accidental, separable or inseparable? An inseparable feature is necessary; a separable one can cease to apply.
'Human is a rational animal' gives an essential account. 'Human is capable of laughter' identifies by a property. This distinction prepares the next discussion of definition, essential definition and description.