source: [lemma=on] [tag=NN] [□=□] □
destination: [lemma=on] [tag=NN] [lemma=□] □
spec: The paper reports on a controlled experiment that investigates the effect of defect detection techniques on software product and inspection process quality . The locking engagement is very firm , but is easily releasable by urging the top edge of the outer container wall portion outwardly and downwardly about a lower annular hinge portion of reduced material thickness , whereby the upper locking part of the outer container wall portion is swung out of its locking engagement and down into a selfstabilized position .