DSL or SDL???

Which one is it? "Directed self learning", or "Self directed learning"...
which ever it is, one thing for sure, we(most of the medical students) find it very lazy to do it!

But who can blame us, it requires us to search deep inside the very core of our "CPU"(i.e brain) for the answers, but what some of us(especially me) will get is, a blue-screen-error! LOL...
On the other hand, These questions are vital for medical practitioners to know since the are the very basic of medicine! So, I guess taking an hour or so to revise our past years notes to refresh our knowledge about it will in the end benefit us...