 Kalam and Dr V S Arunachalam, metallurgist and scientific adviser to the Defence Minister, worked on the suggestion by the then Defence Minister, R. Venkataraman on a proposal for simultaneous development of a quiver of missiles instead of taking planned missiles one after another.R Venkatraman was instrumental in getting the cabinet approval for allocating 3.88 billion for the mission, named Integrated Guided Missile Development Programme (IGMDP) and appointed Kalam as the chief executive.Kalam played a major part in developing many missiles under the mission including Agni, an intermediate range ballistic missile and Prithvi, the tactical surface-to-surface missile, although the projects have been criticised for mismanagement and cost and time overruns.