Exercises, tagged to whatever learning style gets results, become more complex as performance improves.

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The learning curve is usually thought of as a gradual incline, with the assumption that as you learn, performance improves bit-by-bit over time.

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"If Odinga's performance improves, as seems likely, and with this decision on the rejected votes, then it's inevitable there will be a runoff, " said Nic Cheeseman, a lecturer in African politics at Oxford University who is an official observer of the election.

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The brand is as the brand does: It improves athletic performance and has the science to prove it.

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This not only improves application performance but also reduces server CPU utilization by as much as 30 percent, which potentially reduces the number of servers needed.

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"Performance-related pay is increasingly discredited elsewhere as a means of motivating employees and there has never been any evidence that it motivates teachers or improves their performance, " said NUT general secretary, Christine Blower.

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