Login as Admin Create a course. Enrol a Teacher and at least three students in the course. Login as a Teacher. Access to the "Gradebook setup" clicking over the Grades option in the Navigation menu and selection the "Setup" tab. Add four grade items with the following "Item name"s: "item1", "item2", "item3", "item4". Make sure the "Grade type" is set to "Value". Access to the "Edit calculation" form for the "Course total". Set the ID numbers for the items to "item1", "item2", "item3" and "item4". Enter in the Calculation text area one of the formulas you'll find at the end. Go to "Grader report" and "Turn editing on". Enter manually the following values for the item1, item2, item3 and item4: user1: 0 for all the items user2: 5 for all the items user3: 6 for all the items Save grades. Check whether the values of the formulas are 1 (true) or 0 (false) because of the defined conditions (for each formula is explained which is the expected result). Repeat the steps 9-13 for all the formulas   Formulas : if-clause Formula: =if([ [item1] ]>5,1,0) Expected values: user1 = 0, user2 = 0, user3 = 1 if+and(1-2)-clause Formula: =if(and([ [item1] ]>5,[ [item2] ]>5),1,0) Expected values: user1 = 0, user2 = 0, user3 = 1 if+and(1-4)-clause Formula: =if(and([ [item1] ]>5,[ [item2] ]>5,[ [item3] ]>5,[ [item4] ]>5),1,0) Expected values: user1 = 0, user2 = 0, user3 = 1 if+and(sum(1-2)),sum(3-4))-clause Formula: =if(and(sum([ [item1] ],[ [item2] ])>5,sum([ [item3] ],[ [item4] ])>5,1,0) Expected values: user1 = 0, user2 = 1, user3 = 1 if+or(1-2)-clause Formula: =if(or([ [item1] ]>5,[ [item2] ]>5),1,2) Expected values: user1 = 2, user2 = 2, user3 = 1 if+or(1-4)-clause Formula: =if(or([ [item1] ]>5,[ [item2] ]>5,[ [item3] ]>5,[ [item4] ]>5),1,0) Expected values: user1 = 0, user2 = 0, user3 = 1 if+or(sum(1-2)),sum(3-4))-clause Formula: =if(or(sum([ [item1] ],[ [item2] ])>5,sum([ [item3] ],[ [item4] ])>5),1,2) Expected values: user1 = 2, user2 = 1, user3 = 1 if+and(or(1-2),or(3-4))-clause Formula: =if(and(or([ [item1] ]>5,[ [item2] ]>5),or([ [item3] ]>5,[ [item4] ]>5)),1,2) Expected values: user1 = 2, user2 = 2, user3 = 1