Context: Beginning in the late 1910s and early 1920s, Whitehead gradually turned his attention from mathematics to philosophy of science, and finally to metaphysics. He developed a comprehensive metaphysical system which radically departed from most of western philosophy. Whitehead argued that reality consists of processes rather than material objects, and that processes are best defined by their relations with other processes, thus rejecting the theory that reality is fundamentally constructed by bits of matter that exist independently of one another. Today Whitehead's philosophical works – particularly Process and Reality – are regarded as the foundational texts of process philosophy.

Question: What did Whitehead first study?
Answer: mathematics

Question: What was Whitehead's second area of study?
Answer: philosophy

Question: What was Whitehead's final area of study?
Answer: metaphysics

Question: What type of system did he develop?
Answer: metaphysical

Question: What did Whitehead argue reality consists of?
Answer: processes

Question: During which decade did Whitehead's focus start shifting away from mathematics?
Answer: 1910s

Question: After moving away from mathematics, what subjects did Whitehead explore?
Answer: philosophy of science, and finally to metaphysics

Question: As opposed to physical objects, what did Whitehead believe reality is composed of?
Answer: processes

Question: What was the predominant theory of reality that Whitehead opposed?
Answer: reality is fundamentally constructed by bits of matter that exist independently of one another

Question: What book of Whitehead's is now considered a primary source of process philosophy?
Answer: Process and Reality

Question: During which decade did Whitehead's focus start shifting away from science?
Answer: Unanswerable

Question:  As opposed to physical objects, what did Whitehead believe nonreality is composed of?
Answer: Unanswerable

Question: What song of Whitehead's is now considered a primary source of process philosophy?
Answer: Unanswerable

Question:  After moving away from mathematics, what subjects did Whitehead reject?
Answer: Unanswerable

Question: What was the predominant theory of reality that Whitehead agreed with?
Answer: Unanswerable