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The IT governance is defined as a set of rules, activities and processes that fits with the IT company strategy, ensuring the return on various aspects provided by IT in terms of services and maintainability of the organization. Currently, change management appears as a sensible point into the IT governance. The main activity of change management is related to scheduling definition. This scheduling definition consists in allocate a set of changes to each change window. The current literature has some works that argues about a sequential and parallel implementation of changes allocated into each change window. This work proposes a new model that presents two important contributions: The first contribution is related to scheduling optimization with a model of parallel implementation of changes in agreement with BDIM concepts, resulting in a higher number of changes in each window and consequently reducing the time to implement the change. The second contribution consists in determine the total implementation time of each family of changes, considering the concept of indirect dependency presented in this work.