1) A private instance method of an object can access protected instance variables of that object. 2) If a static method of a class takes an object of that class as argument, it can access private data members of that object. 3) All instances of a class have the same types of instance variables and the same instance methods. 4) Storing numerical data in a binary file usually takes less disk space than using a text file. 5) Without sorting or hashing, the best way to search an array is using sequential search. Good luck!