Which phase of the SDLC involves requirements modeling and data processing?

The phase of the Software Development Life Cycle (SDLC) that focuses on requirements modeling and data processing is the systems analysis phase. This phase is crucial because it involves gathering and analyzing the requirements for the system from stakeholders, defining what the system must accomplish, and determining how data will flow and be processed within the system.

During the systems analysis phase, analysts work closely with users to understand their needs and document the requirements. This includes understanding the current data processing methods, identifying gaps or issues in existing systems, and ensuring that the new system will adequately address these needs. The results of this phase typically lead to models and specifications that will guide the design phase, ensuring that the system is built to fulfill the identified requirements.

In contrast, the design phase focuses on creating the architecture of the system based on the requirements gathered during the analysis phase and does not specifically delve into requirements modeling. The implementation phase involves the actual construction of the system, translating the designs into code, while the testing phase is dedicated to verifying that the system works correctly according to the requirements established earlier. Therefore, the systems analysis phase is the most accurate choice for this question, as it encompasses the essential activities of requirements modeling and data processing identification.