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_id	127c
authors	Bhavnani, S.K. and John, B.E.
year	1997
title	From Sufficient to Efficient Usage: An Analysis of Strategic Knowledge
source	Proceedings of CHI'97 (1997), 91-98
summary	Can good design guarantee the eflicient use of computer tools? Can experience guarantee it? We raise these questions to explore why empirical studies of real-world usage show even experienced users under-utilizing the capabilities of computer applications. By analyzing the use of everyday devices and computer applications, as well as reviewing empirical studies, we conclude that neither good design nor experience may be able to guarantee efficient usage. Efficient use requires task decomposition strategies that exploit capabilities offered by computer applications such as the ability to aggregute objects, and to manipulate the aggregates with powerful operators. To understand the effects that strategies can have on performance, we present results from a GOMS analysis of a CAD task. Furthermore, we identify some key aggregation strategies that appear to generalize across applications. Such strategies may provide a framework to enable users to move from a sufficient to a more ef)icient use of computer tools.
keywords	Strategies; Task Decomposition; Aggregation
series	other
email
last changed	2003/11/21 15:16

_id	d60d
authors	Flemming, U., Bhavnani, S.K. and John, B.E.
year	1997
title	Mismatched Metaphor: User vs. System Model in Computer-Aided Drafting
source	Design Studies 18 (1997), 349-368
summary	We report findings from an extensive study of the users of a Computer-Aided Drafting (CAD) system. Our observations suggest that the CAD system is used inefficiently, because users approach computer_aided drafting from a T-square metaphor reflecting their past experience with traditional drawing media. This prevents them from discovering and using effectively powerful system commands that have no equivalent in manual techniques. These findings suggest that we should rethink the ways in which CAD users are trained and manuals are written, and that we introduce CAD users to a more strategic use of CAD, particularly to a Detail/Aggregate/Manipulate (DAM) strategy that takes advantage of the compositional logic underlying a design.
keywords	Architectural Design, Computer_aided Drafting; User Behaviour; Case Study; Modelling
series	journal paper
email
last changed	2003/05/15 21:45

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