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Conceptual Change Theory and
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34 therms algorithm analytical engine arithmetic sequence assignment statement charge cognitive common width concepts conceptual change theory conditional statement cost rule data statement decision tree divide by 100 epistomological equal to six establish code evaluation EXECUTE EXECUTE(analytic EXECUTE(assignment production system EXECUTE(expression production system EXECUTE(FOR-NEXT production system EXECUTE(IF-THEN production system EXECUTE(output production system EXECUTE(round-off production system EXT.ENV.I five flowchart FOR-NEXT loop FORTRAN G0TO going hand calculations heights IF-THEN information processing initial inner loop input inscribed rectangles integer JSR(G0AL knowledge machine mathematical memory minus move multiply nearest cent novices number of rectangles operation output Posner and Strike print statement problem solving problem space procedure program refinement programming language PS-ADD(EXT.ENV.I READ statement READ-DATA represent retrieval round round-off rounding-off Simon and Simon six therms STEP STEP-LIST strategy symbol structures symbol table TEST-ALG0RITHM therms is less