10th April, 2015
Although both terms i.e. Capacity and Availability looks similar to process practitioners who has just started the CMMI journey, but in actual these terms have different meaning and focus.
Capacity Management is the management of the total capability or the maximum quantum of work that can be performed because capacity refers to the maximum amount of the work that can be performed or the maximum amount of service that can be delivered. Capacity can be maximum size, maximum volume, or maximum throughput, etc., of a particular entity that it can deliver or perform. Examples of capacity, quoted in the CMMI-SVC Model, include the following:
Availability Management is the management of the quantum of work that is available or that can be done within the maximum amount of work possible. This means within the maximum amount of service that can be delivered, how much can be really delivered is the availability.
Examples of service system components given in the CMMI Model for which availability can be a concern include the following:
To summarize, Capacity and Availability Management is the equilibrium between what you can accomplish and what you have available to accomplish at a given point in time and depends on:
Source: CMMI-SVC Model, Version 1.3
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