While crazing is classified as a glaze defect, it can also be corrected by adjusting the clay body. The goal is to adjust the glaze and clay body to cool at a compatible rate with the glaze coming under slight compression.
Making pottery or working with clay in any capacity requires information, personal experience, training in techniques, endurance, and the ability to turn theory into practical application. Unfortunately, these days, all of the required skills and knowledge are not obtainable at one location.
Since pottery is an endeavor that involves many steps-any of which can cause total failure-potters often misguidedly cling to a set method or technique that they think will provide a guaranteed result.