This mode involves careful organizing and developing of two concepts. Comparisons examine similarities; contrasts examine differences. Usually, the two organizational methods used are the block method and the point-by-point method. Clear transitions which indicate comparison include - also, in the same way, likewise, similarly. Contrasts are indicated by although, but, however, on the other hand, still, yet, nevertheless, in contrast. This mode explores how something works. A basic cookbook recipe and laboratory reports are examples of this mode. Usually, the writer must go beyond a mere blow-by-blow narrative and use analytical skills to examine why each step is important to the process and to the final product. Thus, a clear controlling idea, a purpose, is necessary to unify the essay. Transitions common to this mode are first, second, finally, before, after, meanwhile, as since, when, then, at the same time.