Marr's three levels of analysis

Marr’s three levels of analysis provide a framework to understand how a complex system, like the brain, processes information. The first level, the computational level, explains what problem the system is solving and why. The second, the algorithmic level, describes how the system solves the problem—what methods or steps it uses. The third, the implementation level, details how these processes are physically realized in the brain’s structures. Together, these levels help us understand biological processes from the general purpose down to the specific neural mechanisms.