Test objectives determine the testing strategies. Now, let us see what sort of object tools could be there? Someone could say: "I want to find out error, as many errors as possible". And someone says: "I want to see that a software is reliable, what I want is the reliability of the software. Or, is a software valid?". Each of these testing has its own object, so we must really look to what are the objective for our test, so that we could properly design test strategies.