Elementary school children and preschoolers were instructed to use an
elaboration strategy, elaborative interrogation, which involves respon
ding to ''why'' questions. The response requires learners to search th
eir own knowledge to try to make novel facts more meaningful. In each
of 6 studies, students were presented novel facts that were consistent
with the types of facts they might encounter when learning from texts
(e.g., facts about animal behaviors, fictional characters, or Canadia
n provinces). Elementary students (grades 4-8) demonstrated much highe
r recall for these facts when they were instructed to use elaborative
interrogation to generate their own elaborations of facts rather than
studying experimenter-provided elaborations or repeating the facts. Pr
eschoolers' (ages 2-6) performance was also higher, although benefits
were more modest at this age. The successful implementation of elabora
tive interrogation was related to learners' knowledge base, so that ch
ildren with more expansive and developed knowledge bases demonstrated
greater learning gains than their less knowledgeable peers. We discuss
dependencies among strategies, learning, and knowledge base as critic
al in determining applications of elaborative interrogation in classro
oms.