ISWIM can be looked on as an attempt to deliver LISP from its eponymous commitment to lists, its reputation for hand-to-mouth storage allocation, the hardware dependent flavor of its pedagogy, its heavy bracketing, and its compromises with tradition.
From Landin’s paper:
6. Relationship to LISP
ISWIM can be looked on as an attempt to deliver LISP from its eponymous commitment to lists, its reputation for hand-to-mouth storage allocation, the hardware dependent flavor of its pedagogy, its heavy bracketing, and its compromises with tradition.