Current research has focused on understanding the processing demands associated with the learning of sequential movement patterns. For example, Klapp (1995, 1996) proposed a two-process model for the planning and execution of sequential tasks requiring precise timing of the individual elements. Verwey (1999, 2002) proposed a hierarchical model for the control of rapid keying sequences. The underlying theme of the current paradigms is to understand costs associated with planning / organizing individual elements and the concomitant costs of sequencing elements in motor chunks. Data from recent experiments addressing the issue of the processing demands associated with planning sequential movements will be addressed. The results demonstrate that costs associated with planning movements change as strings of individual elements become associated together in a meaningful way (i.e. a motor chuck). These data will be reviewed in the context of the current theories regarding the planning of sequential movements.Keyword(s): performance, research