The biggest factor about change in anything at any level is "Is there really a need for a change and what kind of change is needed?" Most companys succeed as they find a void in society and fill it and adapt new ways to survive and introduce new products as needed. This is the very basic answer to your question minus many detailed details
Discuss the important factors responsible for change. Explain with the help of examples, what makes excellent companies tick?
The best type of change that I could think of and set as an example is whenever there are changes in the laws of the government regarding business. Business should be able to adapt and be flexible in order to sustain the life of the company.