HELD : The impugned order could not be said to be under s. 11 ( 4) even though it was stated that the assessment was made to the best of the officer's judgment, because, the condition precedent under that subsectioa is that a registered dealer who has furnished returns should fail to comply with the terms of the.notice issued under s. 11(2). But assuming it was made under s. 11 ( 4), the order could not be attacked on the grouRd of its being beyond limitation. Under s. 11 ( 4), if a re· gistered dealer having furnished returns in respect of a period, fails to comply with the terms of a notice under 1. 11 (2), the Asse.sing Autho· rity shall, within three years after the expiry of such period, proceed to assess, to the best of his judgment, the amount of tax due from the dealer. "Such period",, refers to the period mentioned earlier in the sub-section, that is, in the present case, to the quarters in respect of whith the firm had to submit returns. The assessment proceedin~ commence, in the case ·of a registered dealer, either when he furnishes a return or when a otice is issued to him undor s. 11(2), and would be pending ftom the time they are initiated until they are terminated by a final order of as,,.ssment. Therefore, if such proceedin!l' were taken ""ithin the pr"'°ribed time, thougll the assessment was made final subeeuently, even after the expiry of the prescribed time, no question of limlla!ion would ari..e. [14 H; 15 A, F, G; 17 G; 18 B-F) ·