One major difference between these two approaches is the agent's responsibility. "Positive" consequentialism demands that we bring about good states of affairs, whereas "negative" consequentialism requires that we avoid bad ones. Stronger versions of negative consequentialism will require active intervention to prevent bad and ameliorate existing harm. In weaker versions, simple forbearance from acts tending to harm others is sufficient. An example of this is the slippery-slope argument, which encourages others to avoid a specified act on the grounds that it may ultimately lead to undesirable consequences.