The main aim of this paper is to present how to derive logical software architectures for CRUD (Create, Read, Update and Delete) applications using a specific technique called 4SRS. In this technique, a component diagram, which is obtained through transformations of use cases, is used to represent the logical software architecture. To show that the 4SRS technique, which was initially devised for behavior-intensive reactive systems, is also effective and gives seamless results for other software domains, it is being experimented on data processing systems, which typically follow a CRUD pattern. For demonstration purposes, the FPL tower interface system, which is responsible for communication between air traffic control operators and flight data processing system on airports of Portugal, has been used as a case study.