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spec: Three Years Trained or Four Years Trained , who completes a course of training which entitles the teacher to be classified as Three Years Trained , Four Years Trained or Five Years Trained , as the case may be , shall progress to the step on the salary scale which shall be determined by the teacher 's years of service on the lower classification and the teacher 's new qualifications and the teacher shall retain his or her normal incremental salary date . A central question in visual neuroscience is how such local information is integrated to generate a unitary and coherent percept . Both sides frame the central question in similar terms : Do drugs cause more harm than drug laws ? Each hoot was accompanied by a white flash from his collar as his throat pouch swelled ( and presumably showed the lighter , lower parts of the feathers ) . Squeezing out the same power at half the temperature creates a domino effect of cost savings . A central question in spatial ecological theory is what mechanisms are responsible for generating and maintaining spatial patterns in the distribution of organisms , or what are the origins of patchiness .