id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
ajis02-441	Hasan, Helen	Information Systems as Dialectic, Tool - Mediated Activity	2002	10	.pdf	application/pdf	6146	250	43	Figure 4: Four levels of contradictions in a network of human activity systems (Engestrom 1999) Activity systems are constantly working through contradictions within and between their elements and with other related activities.	cache/ajis02-441.pdf	txt/ajis02-441.txt