Each company wants to sell its product as widely spread as possible: in its city, country or even in the whole world.
However, it is very difficult to invent the universal approach for your professional field, and mostly impossible. Each group of potential clients has its own standards, laws and even lifestyle, which definitely affects user requirements.
There is a universal standard in the Telecom field for creating applications: TM Forum API Specification.
I will tell you about this standard, why it can be useful to learn and use this standard not only in Telecom and, of course, I will present the experience of T-SYSTEMS of using the TM Forum API Model.