What is a key element to avoid in writing conclusions?

Introducing a new idea in the conclusion of a piece of writing can disrupt the coherence and clarity of the overall message. Conclusions are designed to summarize and reinforce the main points discussed in the piece, allowing readers to grasp the central themes without presenting anything that hasn't already been introduced. When new ideas are introduced at this stage, it can confuse readers, as they may feel they need more background information to understand the fresh concepts being presented. The conclusion's purpose is to provide a sense of closure and reiterate the significance of the discussion rather than to open new avenues for exploration. Thus, avoiding the introduction of new ideas helps maintain the integrity and effectiveness of the conclusion.