According to Wanda Sanseri, author of Spell to Write and Read, the two essential tools for learning the logic of English spelling are the phonogram cards and the spelling rules. These cards provide a visual memory jogger of the rules for easy review and reinforcement. For example, on the front of one card are the letters "XS" covered by the international symbol for no (a circle with a slash through it). The back of the card has the rule being illustrated which is: "X is never followed by S." While based on the 28 rules taught in Spell to Read and Write and The Writing Road to Reading, these cards can stand alone as a beneficial aid for anyone teaching spelling. Cards are available in two sizes: small - 4.25" x 5.5" or large - 8.5" x 5.5".