• We design a prototype system to assist medication taking in the home using a medicine chest ECabinet, evaluate our algorithm through comprehensive experiments and analyze our algorithm in detail. The rest of the paper is organized as follows. Section 2 discusses related work. Section 3 describes our multi-activity model. We present our prompting algorithm in Section 4, and describe our experience in building a medication system in Section 5. Experimental results are reported in Section 6. Finally, Section 7 concludes the paper.