The notion of location of part objects is introduced, yielding a reference to the containing object. Combined with locally defined objects and classes (block structure), singularly defined part objects, and references to part objects, it is a powerful language mechanism for defining objects with different aspects or roles. The use of part objects for inheritance of code is also explored. Presented at TOOLS EUROPE'92, Dortmund, Germany. In Technology of ObjectOriented Languages and Systems -- TOOLS7, G. Heeg, B. Magnusson, B. Meyer (eds.), Prentice Hall, 1992. The work of Ole Lehrmann Madsen has been supported by the Danish Research Councils