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The spiral approach is very old. A spiral spread over multiple years=
is an old idea, and a sprial within one year is also an old idea.
The first I encountered it in one year was with the book "The New Col=
lege Physics, A Spiral Approach" by Albert V. Baez. In case you don'=
t know, or are wondering, Albert Baez is the father of folk singer Jo=
an Baez. He is also co-inventor of the x-ray microscope. His spiral=
textbook was pubished in 1967. I started college in 1968, and this =
book was the text for my first college physics course.