Mastering sight words is an important building block for reading fluency. It is my feeling that mastering thirty sight words is more valuable than "sort of" knowing 100. It is for this reason that I am choosing to assign Kindergarteners the 30 most important sight words this year for mastery. The rest of our time and energy will be spent learning, rhyming, phonemic awareness, fluency, phonics, etc. These are the necessary skill for decoding words.