Variability of pesticide residues are inevitable. A deafult variability factor (Vf) of 3 are used but incase of medium and large size commodity crops a wide range of Vfs are estimated for several researchers. Therefore, I think that it shuold be reconsidered when more data are available. So, I think that it is an emerging need to conduct research for the medium and large size commodity crops especially for which crops, that did not selected till today.....