Considering how hard it was for the extraordinary Frank McCourt to learn how to teach, one has to wonder whether  individual teachers can really measure their own progress.
Considering the case of Frank McCourt, one can wonder whether teachers can measure their own progress or not.
mnli hypothesis: Considering the case of Frank McCourt, one can wonder whether teachers can measure their own progress or not. premise: Considering how hard it was for the extraordinary Frank McCourt to learn how to teach, one has to wonder whether  individual teachers can really measure their own progress.