The Topical Memory System (TMS) and Topical Memory System: Life Issues were developed by The Navigators as a simple, easy-to-use system to help believers memorize key verses that point to basic truths and important instruction. If you want to memorize Scripture but aren’t sure what to memorize or how, this system is the perfect launching point to begin hiding God’s Word in your heart. Below is a list of the 5 pivotal topics addressed in the original Topical Memory System.