In this thesis it is analyzed a merge of two companies both have a network of sales and production plants. All these activities concerned collection and expenditures of money. Cash liquidity is managed by a central treasury with three branches that work in completely different manners however now there are no more two companies but only one. Being a unique company implied several projects of convergence to reach a new model of treasury in which employees work in the same way. The convergence process lead to problem of communication, delay of projects, mix of IT roles with business roles moreover convince people belonging to different companies and with different backgrounds to converge to a new treasury process is far more difficult than develop the new processes.