claim: The Burj Khalifa contains 77 elevators.
evidence: The Ontario rubric is a rubric system used to mark students in the Ontario provincal school system .. rubric. Rubric ( academic ). Ontario. Ontario. The Ontario rubric is typically a chart with five columns .. rubric. Rubric ( academic ). Ontario. Ontario. The first defines the category that is being evaluated , and the other four show levels 1 through 4 .. Level 1 is 50 % -- 60 % , Level 2 is 60 % -- 70 % , Level 3 is 70 % -- 80 % , and Level 4 is 80 % -- 100 % .. Some teachers represent a perfect mark by suffixing a plus sign to the 4 -LRB- `` Level 4 + '' -RRB- .. plus sign. plus sign. The Ontario rubric system is used more or less throughout high schools and elementary schools in Ontario .. rubric. Rubric ( academic ). Ontario. Ontario. elementary schools. elementary schools. The rows are typically broken into four strands  :. Knowledge / Understanding. Thinking / Inquiry. Application. Communication. In the elementary schools they are also sometimes organized into sections for projects , for example  :. elementary schools. elementary schools. Appearance  /  Neatness. Organization. Information and Understanding. General Appeal. Rubrics are used for marking .. Their purpose is for a more objective marking process when marking subjective items .. i.e. an essay , piece of artwork , tech project , or any project with multiple components i.e. computer program .. They also aim to avoid student / teacher confusion .. Rubrics provide a breakdown of these four strands .. These strands are not weighted evenly .. For example If a student receives a low mark in only one of the rows , their overall grade could be drastically reduced if that strand is weighted heavier than the others .. Similarly , if one receives a low mark in a strand that is not weighed heavily , it can have little effect on their mark .. The Ontario Rubric appears to be evolving into something known as a `` competency profile '' .. Ontario. Ontario. Competency profiles are seen as being more user-friendly for teachers and students than the traditional text-based list of criteria .