I took this test a while back and when I took it again today I got the same result above. That's pretty reassuring in my book. I've had the idea for a long time that I must be introverted, but I have times where I'm extroverted (which is completely normal). That threw me for a loop for years, until just recently, I've come to the conclusion that I really am an introvert and I'm completely satisfied with that. I'm getting to know myself pretty well in my old age.
This test is really amazing. It's crazy to think that answering yes or no to a list of ridiculous questions could somehow summarize your personality so accurately. But it does. Here's a little bit about me and my fellow ISFJs.
ISFJs are characterized above all by their desire to serve others, their "need to be needed." In extreme cases, this need is so strong that standard give-and-take relationships are deeply unsatisfying to them
they are notoriously bad at delegating ("If you want it done right, do it yourself"). And although they're hurt by being treated like doormats, they are often unwilling to toot their own horns about their accomplishments because they feel that although they deserve more credit than they're getting, it's somehow wrong to want any sort of reward for doing work (which is supposed to be a virtue in itself).
In the workplace, ISFJs are methodical and accurate workers, often with very good memories and unexpected analytic abilities; they are also good with people in small-group or one-on-one situations because of their patient and genuinely sympathetic approach to dealing with others.
Like most Is, ISFJs have a few, close friends. They are extremely loyal to these, and are ready to provide emotional and practical support at a moment's notice. (However, like most Fs they hate confrontation; if you get into a fight, don't expect them to jump in after you. You can count on them, however, run and get the nearest authority figure.) Unlike with EPs, the older the friendship is, the more an ISFJ will value it. One ISFJ trait that is easily misunderstood by those who haven't known them long is that they are often unable to either hide or articulate any distress they may be feeling.
Update: October 24, 2013
Just under two months later and this is the outcome of my test, which I feel is truer to me:
It would be fascinating to take this test again in a year to see if anything changes drastically.