What issues would you consider to be the most important for a company that is considering the use of a functional structure?

Functional structure has issues especially with the definition of functions. In the formulation phase, if the functions and roles are not clearly and correctly defined, the whole structure will not perform correctly. This is the most fundamental and serious problem of the functional structure. It is not easy to change if the structure is well built into a hierarchy of functions. Therefore, it is important to brainstorm and figure out the functions correctly right from the beginning.