Figure 9. Changing the angle values (speed of upgrade), in degrees
Source: Prepared by author
Figure 10. Changing the share of new products as a result of the upgrade
Source: Prepared by author
Changing the angle means a change in the intensity of the process of upgrading
software, which also affects duration of its useful life.
To illustrate the process of replacement of old products with new ones, we have
added the information about changes of the old products shares to the chart below. The
process depends on the speed of new product upgrades implementation and the
sequence of old products displacement (data presented in Table 3, visualization in Fig.
11).
We propose to determine the sequence of old products displacement taking into
account the expected deadlines of the life cycle for particular products mentioned
above. However, the final decision about the moment when users should cease to use
the product in the organization is up to the management based on their risk assessment.
To determine the number of copies of the software that should be purchased at one
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