Provide a research essay about the change management in a company and summarize how it is a key for successful digital transformation. You should address potential issues such as employee fear of change and outline a strategy for managing these concerns. Discuss which change management models (at least 1 people-based and 1 process-based) are most appropriate for the company's situation and explain how you will apply the model based on its different aspects and steps. You can include examples of failure in digital transformation due to their drawbacks in change management.