In this phase, careful estimates are your only input, as follows:
- Number of transactions for each user function
- Number of I/O operations per user function (DASD and terminals)
- Time required to key in user data (including user "thinking time")
- Line speeds (number of characters per second) for remote terminals
- Number of terminals and operators required to achieve the required rate
of input
- Maximum rate of transactions per minute/hour/day/week
- Average and maximum workloads (that is, processing per transaction)
- Average and maximum volumes (that is, total number of transactions)
- Likely effects of performance objectives on operations and system programming.
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