Numerous studies of memory development have been conducted on memory capacity, memory strategy, and metamemory. Recently, DeMarie and Ferron (2003) revealed a model for explaining memory performance across two groups of children, ages 5 to 8 years and 8 to 11 years. This model proposed that the most important factor for recall is memory strategy. Many studies have indicated that children do not use an optimal strategy for all types of memory tasks, but often apply several strategies to different types of memory task (Coyle & Bjorklund, 1997). The report of DeMarie, Miller, Ferron, and Cunningham (2004) has noted the variability in strategies used by children and that using multiple strategies led to better memory performance. Other research (Toyota & Morimoto, 2000, 2001) has also noted that children with high academic performance (good achievers) used many more memory strategies than poor achievers. In addition, a good achiever could assign an optimal strategy to each learning situation, e.g., reading, summarizing, or memorizing. These results suggested the importance of flexibility in selecting and using different strategies for different tasks. Unfort-unately, it is difficult to facilitate flexibility in selection of memory strategies; first, it is necessary to teach strategy variation, and to teach about the effectiveness of each strategy for remembering different types of information. According to the model of DeMarie and Ferron (2003), it seems that an effective way to improve the memory performance of children is to teach them a single effective memory strategy. Generally, a memory task requires two responses: choice of a memory strategy and memorization of the target. Both compo-nents require learning resources or capacity (Kee & Davies, 1988). Because young children have fewer resources, they may not be able to allocate sufficient resources or capacity to both components of the task. If they are taught a strategy that requires more resources, they may allocate all their resources to the strategy, leaving too few resources for memorizing the target. Memory performance would then be poor, despite possible use of an effective type of strategy. This dual requirement of resources for the two components of a Abstract The purpose of the present study was to review the recent research on memory development for applications to educational situations. Recent studies of memory during childhood have indicated that the quantity, the quality, and especially the flexibility of memory strategies are critical for memory performance. Some research has stressed that the most critical factor is the use of a memory strategy which takes into account the resources or stage of development of an individual. Because effective memory strategies use more mental resources, there are fewer residual mental resources for remembering information about a target and therefore the memory of the target may be poorer. Memory strategies may be unsuitable for children, who have limited resources, but it may be possible to teach effective alternative strategies. It is critical to examine how to teach effective memory strategies taking into consideration of resources available to children.