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Chapter 4

Serial number Time to make the Total cumulative Cumulative
of units unit concerned time to make all average time per
(hours) units so far unit

01 10.000 10.000 10.000
90%
02 8.000 18.000 9.000

03 7.386 25.386 8.462 90%

04 7.014 32.400 8.100

In this example, Wright’s law is verified as the cumulative average decreases to 90%
of the previous average every time we double the cumulative output, such as from
1 to 2 of from 2 to 4 units.

We therefore say that the process demonstrates a 90% learning rate.

Illustrations and further practice

Now attempt example 1 ‘Complete the Table’ and example 2 ’Learning Rate’ from
Chapter 4.

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