ok, my bad, i didn't explain it good enough.
The investigation which Strobel went through to disprove Christianity was not intended to be published, but after he was converted he decided to publish it and that's where the name 'Case for Christ' was brought into the picture. His initial attempt was to disprove, but the product turned out to be proved.
And sorry about reviving and old thread, i didn't really notice how old it was... My apologies.