Dr. Kerski makes perhaps the most important point that needs to be
discussed.  He correctly points out that to "do" GIS you must first
"know" geography.  Geography is the "G" in GIS as Dr. Jerry Dobson has
pointed out in his columns of the same name.  Without a fundamental
ability to first perceive, then acknowledge the spatial nature of
problems, the GIS is are rather ineffective tool.  As Dr. Kerski
points out there are any number of potential real-world problems that
can be analyzed with GIS, or without it for that matter.  I've always
been a strong believer in project based learning because it gives
incentives for the process itself.  What we need then is a set of
geographic concepts that we hope to achieve from these activities.
After having taught GIS and GIS related courses since 1983 I find that
the primary difficulties in learning the technology revolve around a
lack of problem identification and problem solving skills (whether
spatial or aspatial for that matter), and a lack of incentive to learn
those skills.  Dr. Kerski's idea of providing regional, and/or global
problems gets at the heart of this.
A quick response also to the question of what competencies do the
teachers need is warranted.  In many cases, at least here in the
United States, the (k-12) teachers are burdened with a host of
activities not related to teaching.  Additionally, they are forced,
through the "no child left behind" law to teach to the test.  Asking
them to learn more technology is probably not going to be as
successful as one might hope.  They are often willing but simply don't
have the time to learn these or the technology to implement them.
Having said that, it would certainly be possible to provide
opportunities for them to learn the basic skills necessary to be
successful at GIS.  As a former secondary school teacher what I always
looked for was examples that I could modify.  The examples could be a
wonderful resource for the teacher to adapt to their own situation.
Thank you for posing these questions and for allowing us to
contribute.
Mike DeMers