In this study, the Influence of various passes and processing routes of equal channel angular pressing (ECAP) on the workability of aluminium alloy AA 6063 has been Investigated. Aluminium alloy specimens were subjected to ECAP using a 105° angle ECAP die using three processing routes for up to three passes at room temperature. Microstructure characterization and mechanical property measurements were carried out. Workability was determined by means of upsetting tests on cylindrical collar specimens machined from specimens processed by ECAP and workability limit diagrams for various processing conditions have been generated. A Cockcroft fracture criterion was used to analyze the workability data. It is observed that processing to first pass results in enhanced mechanical properties with only a slight decrease In workability. Taking Into account both mechanical properties and workability, ECAP to pass one can be considered as an optimum processing route for aluminium alloy AA 6063. © 2011 Wiley-VCH Verlag GmbH & Co. KGaA. Weinheim.