As a result of organizational restructuring, the role of the middle managers has changed over time. Studies of change processes have increasingly placed focus on middle managers. According to researchers, middle managers play a key role in implementing the change. When putting the change into practice, there are factors affecting the middle managers. However, further research is needed regarding what constrains and enables the middle manager in these change processes.

Therefore, the purpose of this thesis is to explore the sensemaking and sensegiving process during organizational change, with focus on middle managers. To answer to the purpose, a theoretical model combining Balogun and Johnson’s (2005), Nonaka and Takeuchi’s (1995) models and theories of middle management is developed. By using the model we analyze the centralization of the accounting departments at the Swedish energy company Vattenfall. This change process constitutes the case of this thesis.

The empirical findings are based on ten interviews and two group discussions with top management, middle managers, co-workers as well as other key actors in the project providing trustworthiness to our study. A qualitative method using an abductive approach is used in the thesis to explore the actors’ interpretation of the change and capture the complexity of the case.

The conclusion includes enablers and constraints during the sensemaking and sensegiving process for the middle managers during the centralization of Vattenfall’s accounting departments. The identified enablers are the communication channels, a middle manager’s awareness of employees’ approach of making sense, the provided tools used to adjust working processes, some Business Units’ initial negative attitude towards the change, as well as the rejuvenated spirit. Finally, the middle managers themselves enabled the change as a result of their unique role in the organization.

On the other hand, the recognized constraints in the sensemaking and sensegiving process of the middle managers are; concerns regarding middle managers’ future employment, their ‘stuck in the middle’ position, limited resources, new working processes not adopted by some co-workers, and positive attitudes that resulted to flaws in the planning at some Business Units.