I have given links to almost all the mateiral in the post. Rest of the comments are from the facts which I read on the websites of companies. But, if you can tell me which part was ambiguous, I can still help.

Change is inevitable. I feel that moving into new space can be dicy, and organisations which adopt new technology at early stage are like entering completely new space. Take the example of Microsoft. Harris and his team at MC realized that they had to essentially burn down the interface and rebuild MS WORD. They were looking for change, but entered foggy terrains and sometimes the journey was little more than painful.

One could argue that these things have happened in the past and we are not learning!

Well, no one wants to invite problems, but there are circumstances when ASSUMPTIONS go wrong. Beauty of the entire situation is: No problem has same circumstances. Calculations may help to approximately guess the results, but things do change!

I’ll try answering in next log- why lot of times things go wrong in practical world..Have we lost ‘common sense’ or is it something beyond our control!