Final answer:
The four phases of the Systems Development Life Cycle (SDLC) are planning, analysis, design, and implementation, involving detailed project establishment, understanding requirements, iterative design development, and system integration into its environment.
Step-by-step explanation:
In the context of the Systems Development Life Cycle (SDLC), the four phases are planning, analysis, design, and implementation. During the planning phase, the project's scope, goals, and budget are established. The analysis phase involves understanding the requirements and constraints in detail. In the design phase, a detailed design is developed, which may include prototyping, testing, and refinement in a spiral design process, often requiring multiple iterations. The final phase, implementation, sees the actual construction and integration of the system into its environment, which could further involve testing and changes based on real-world use. This process is indeed iterative, with the necessity for flexibility and adaptability as insights are gained and challenges faced.