This program was undertaken to change an old information system technology to a modern open architecture that produces information on demand with greater speed, more versatility, and across diverse operating systems. Since it was designed as a replacement for an operational system, an evolutionary acquisition of capability over a 10-year period was planned. With four more or less equally spaced incremental releases of the new system, each providing added capability, the cost estimating challenge was to produce a credible estimate before initiating Increment 1. This was more than a 10-year evolutionary development; since the new system became operational with completion of the first increment, maintenance began while future capability was under development and existing capability

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