When Jasminda first moved into her apartment, she noticed that her doorknob did not function perfectly. To unlock the door, she first had to jiggle the knob then insert the key at a slight angle and wiggle it in the lock while turning the knob. At first, unlocking the door was an ordeal that took several minutes. After living in the apartment for a month, Jasminda can open the door in a few seconds without even thinking about it. Jasminda's behavior illustrates the effects of