The web page is not accurate: Starting in 1914 Polya was
teaching at ETH Zurich. 
He became a Swiss citizen.
On and off he was in Zurich until
1940 when he moved to the US permanently.

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How to Solve It was written for mathematics

We can easily adapt it to CS.

What is the unknown? What are the data? What is the condition? 

In Software Development:
unknown = design and program
data = inputs and outputs
condition = requirements


Separate the various parts of the condition.

In CS:
Separate the concerns ...









Have you seen it before? Or have you seen the same 
problem in a slightly different form? 

Here is a problem related to yours and solved before. 
Could you use it? Could you use its result? Could you use its method?

Could you imagine a more accessible
related problem? A more general problem? A more special problem?