The slippery slope involves an acceptance of a succession of events without direct evidence that this course of events will happen. In recent times, the Slippery Slope Argument (SSA) has been identified as a commonly encountered form of fallacious reasoning. Though the SSA can be used as a method of persuasion, that doesn't necessarily mean it's fallacious. In fact, SSAs are often solid forms of reasoning.
Conclusion
So, next time someone tries to convince you of something using the slippery slope argument, take a step back and think about whether or not it really makes sense. Chances are, it’s not as scary as it seems.