Question: My company has recently acquired another small company. Now, my company has a ERP system that we are using it presently. Also, the acquired company has an ERP system of its own. 

Now I have been given the responsibility of integrating my company's ERP System with the ERP system of the recently acquired company. To do this, I have to map the data between these two processes and see if there are any redundant features. 

However I was told by my friends that there would be lot of problems when I need to sit with both employees of the two companies, given the fact that my company doesn't treat the other company employees that well in terms of credibility. 

So I wanted to know, how do I make sure that there are no hard feelings between both sets of employees and what steps do I take for effective brainstorming sessions among both the teams?

Answer: 
In this situation, what's done is done. The decision to replace their processes with others has already been made.

If there is bad blood between your company and the acquired company, you may find that your efforts are less than welcome.

It's important that you be assertive, take charge, let others know what your goal is and that you'll need their support. You can add that you also want to make the transition as smooth as possible.

This is an opportunity for you to possibly form a cross-functional team with the goal of merging the data. You are in a position to possibly create a sense of teamwork, if you select the right people to help contribute ideas and energy to this merge project. If you can, select an equal subset of employees from both companies to help collaborate on a solution.

If you listen to concerns and be objective, it will go a long way towards helping avoid hard-feelings, but you are in charge of the project and will need to make that clear from the very beginning; otherwise, they may walk all over you.
> 
> how do I make sure that there are no hard feelings
> 
> 
> 

Why? What is the reason to worry about it? You "have been given the responsibility of integrating", not of team building or making peace. Changes typically lead to "hard feelings", it's inevitable. If you blame yourself for them you very likely fail the project. What you need to do in this situation is to identify **negative stakeholders**, identify their needs, and take them into account. That's it.