Translations:Expression Manager how-tos/3/en
From LimeSurvey Manual
LimeSurvey uses the new Expression Manager (EM) module which lets LimeSurvey support more complex branching, assessments, validation, and tailoring. It replaces how LimeSurvey manages Replacements, Conditions, and Assessments on the back-end. It also speeds up processing considerably since it eliminates most run-time database reads.