Columbia subject headings:
Planning--Methodology.
Planning--Philosophy.
Popper, Karl R. (Karl Raimund), 1902-1994.
Rationalism.
Harvard subject headings:
Methodology.
Planning--Philosophy.
Popper, Karl R. (Karl Raimund), 1902-1994--Criticism and interpretation.
Princeton subject headings:
Planning--Methodology.
Popper, Karl Raimund, Sir, 1902---Contributions in methodology.
Rationalism.