Invention scheme Fact Did something happen? What are the facts? Is there a problem/issue? How did it begin and what are its causes? What changed to create the problem/issue? Can it be changed? It may also be useful to ask critical questions of your own research and conclusions: Where did we obtain our data and are these sources reliable? How do we know they're reliable?Fact Did something happen? What are the facts? Is there a problem/issue? How did it begin and what are its causes? What changed to create the problem/issue? Can it be changed? It may also be useful to ask critical questions of your own research and conclusions: Where did we obtain our data and are these sources reliable? How do we know they're reliable? Invention scheme