OK, I am a newish user working with Blender 2.75 since August 1.
I have my first complex project modeled, time for some color. Several objects in my model require different materials on different parts of the object. So, I picked out faces on an object and used the Node Editor to create a new material for them. I then picked the other faces and created another new material for them. So far so good, that object now has the correct materials. Now switching to another object I go into edit mode and pick out several faces. But when I go to materials and try to assign one of the materials to the faces it gets applied to the entire object. I try picking other faces and try applying a different material. Again the entire object is changed to that material.
Am I missing something obvious? Do I need to recreate the same NEW material for each object in order to apply it to selected faces?