Great suggestion, Dan.
An important goal is to encourage people to be in a mode of making a
decision, to be open, you might say, to more than one way of doing
things. It is interesting, though, to consider that if people are
prepared to log information in the way you suggest, they are probably
already open to considering alternatives.
I heard that the iPhone has a built-in tracking widget that knows
where you were over a fairly long period of time. It was a bit of a
scandal in the news a few months back.
How about if you could access that data as part of a conversation with
a traveler, and model the several different ways various trips might
have been taken. The user would not have to tell you what he actually
did. You could list the alternatives in a smart way that just showed
the different alternative cost, emission and time attributes for each
available mode. Knowing what he actually did, the traveller could see
if there would have been a better alternative.
If you could then get permission to amalgamate the results for
publishing purposes, you could show a large number of alternative real
trips that real people have taken, and analyse across that database
the impact of taking one mode versus others. Perhaps a clever
reporting of that data would create a community of interest by other
people who might then be prepared to submit their data for analysis.
All without having to log a single thing.
I can imagine some 'gosh' moments as people see the folly of their
entrenched behavior.
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