There are two significant subsections in this step.
1) Analysis of the data available on the beginning of the project.
It might be done in-house by the specialist within an organisation requesting web system. It could be done in the process of creating paperwork for an invitation to tender for particular web solution. In the different scenario, (no tender), it could be put together by your chosen provider.
2) The system architecture is initially created based on your internal operations.
We may have complex systems that are not used efficiently due to not enough manpower to process data. Business settings may also limit the functionality of the system or require extra elements to be developed which that would not be otherwise created. It is an important money saving and business optimisation step in the process of web system implementation.