You can't alter reality, it's constructed individually, it's you who shapes it ;-)
[Peter Rost, 19.1.2012, responding to my Facebook Status]
I disagreed because I think one has to check each's understanding of "reality".
To make the Moon rotate on another orbit, might possibly be done.
At least all people discussing this would agree that the laws of physics must have to be applied to solve this problem. So all these people would have the same view and understanding of this kind of reality.
For any arbitrary department of a company, there might be reason or even demand to be changed. The CEO wants it, middle management has to support and the Line Manager has to explain and execute the change to his employees. Probably the views of the CEO, the Line Manager and the employees on the reality of the department are very different.
I think it's quite intuitive to see that the reality of this department can be changed pretty good. Lots of people working in the field of Organizational Development are facilitating such Change Processes.
So I'd say:
I can always change the reality, somebodies individual reality as well as an organizational reality, where more individuals are involved in.