Task specification using technical illustrations

Technical illustrations (TI), a way to assemble/disassemble a mechanical assembly, is discussed. The information including not only the shape of a constituent and an order of operations necessary to assemble/disassemble it can be driven from a single TI. However, an additional new TI is often required to further supplement insufficient information obtained from the single TI. The solution requires to resolve the problem which arises in augmenting a model description by unifying the results obtained from several TIs is presented