"A hypothesis is usually constructed on a theoretical structure and thus, is amenable to realistic divergences, as and when necessary". - This statement was based on a lab question. "The key word is testable. That is, you will perform a test of how two variables might be related. This is when you are doing a real experiment". In a dissertation, how is it possible for the author to start off searching the facts to prove or disprove a statement and then change it as the dissertation progresses. If this is allowed to happen, the author may start off by questioning if changing the government will have an affect on recent laws passed to should pets be classified at humans. There has to be a base. By having a hypothesis the student remains focused on the finish line without moving it as time progresses.