A predictive conclusion expresses some thought about a future event based on evidence or facts in the present. It lets you make an educated guess about current trends and where they inevitably lead. For example, in an essay about the rapid technological advances in television viewing, a predictive conclusion would state, "With digital video recorders, 3D technology and self-programming transforming our viewing habits, it's only a matter of time before we're enjoying holographic television shows playing out in life-sized action in our living rooms."
Problem solving conclusions advance a theory or make a suggestion to a main issue or problem presented in an essay. For example, in an essay that examines the correlation between the lack of employment opportunities and violent crime, a problem solving conclusion might express the idea that more job creation and job training programs are needed in low-income neighborhoods to offer young people hope for a future that doesn't include breaking the law to survive.
Call to action or exhortation conclusions are effective for persuasive or argumentative essays. Writers use these essays to convince the reader of a particular point of view, such as a call-to-action conclusion that challenge the reader to action. In another example, a persuasive essay about why it's important for people to become politically involved could conclude by stating, "Men and women over the age of 18 must register to vote and become active in issues that they care about, which is a powerful way of asserting their constitutional right to representative government."
Conclusions that use a quotation from a famous person lend authority to a paper and express a theme or purpose using the words of a credible source. In a paper about the need for people to fight injustices and errors committed in the criminal justice system, a quote by famous lawyer Clarence Darrow that reads, "As long as the world shall last there will be wrongs, and if no man objected and no man rebelled, those wrongs would last forever," is an effective way to sum up the theme, and concludes the essay with a powerful thought.