A computational treatment of aspect in English is presented. A set of aspectual values is introduced and discussed. The lexical and contextual clues for determining aspectual values are determined. The structure of the entry in the main dictionary supporting aspectual (as well as other types of) analysis is illustrated. A computational framework for an aspectual analyzer is described, in which the latter is conceived as one of a group of specialist analysis modules working together, in a distributed (blackboard-oriented) computational environment.