A new quantitative method is introduced into the analysis of the exper
iments on short term serial memory (STSM). In this method, three param
eters are defined to quantitatively represent the performance of memor
y for item and rime order information. These parameters are the diverg
ence, the disorder and the similarity. This method is used in analysin
g the experiments on visuo-spatial STSM. The results show that the par
ameters may reflect some characteristics of STSM.