software engineering summary
2) Yrjo Engestrom, “When is a Tool? Multiple Meanings of Artifacts in Human Activity,” in Yrjo Engestrom, Learning, Working and Imagining, Painettu Kirjapaino Oma Ky:ssa, Jyvaskylassa, 1990, pp. 171-195.
i’ve seen this one a few times. it is pretty good….
