Task analysis is the process of understanding the user's task thoroughly enough to help design a computer system that will effectively support users in doing the task. By task is meant the user's job or work activities, what the user is attempting to accomplish. By analysis is meant a relatively systematic approach to understanding the user's task that goes beyond unaided intuitions or speculat...

This paper explores ways of performing commutative tasks by N parties. Tasks are defined as commutative if the order at which parties perform tasks can be freely changed without affecting the final result. It is easy to see that arbitrary N-party commutative tasks cannot be completed in less than N − 1 basic time units. We conjecture that arbitrary N-party commutative tasks cannot be performed ...

same people as those attending the Conference on Mental Hygiene, and this meeting, which was the longest of the three, was also by far the most experimental and interesting. The Preparatory Commissions, of which there were some 350 in 27 different countries, were perhaps the most important part of the whole Congress activity. The reports from these interprofessional discussion groups were edite...

Scheduling independent tasks on heterogeneous environments, like Grids, is not trivial. To make a good scheduling plan on this kind of environments is usually needed prediction information like host speed, host load, task size and network load. This kind of information is not always available and is often dif f icult to obtain. In this paper we propose an approach that does not use any kind of ...

Gaming the system, a behavior where students disengage from a learning environment and attempt to succeed by exploiting properties of the system, has been shown to be associated with lower learning. Machine learned and knowledge engineered models have been created to identify gaming behaviors, but few efforts have been made to precisely identify how experts code gaming behaviors. In this paper,...

Task  repetition  is  now  considered  as  an  important  task-based  implementation  variable  which can affect complexity, accuracy, and fluency of L2 speech. However, in order to move towards theorizing  the  role  of  task  repetition  in  second  language  acquisition,  it  is  necessary  that individual variables be taken into account. The present study aimed to investigate the way task r...

This study was aimed to compare long-term effects of collaborative and individual task planning on Persian-speaking EFL learners’ writing performance, using Brown and Bailey’s (1985) rating scale. Therefore, a group of 90 upper-intermediate EFL learners in collaborative task planning, individual task planning, and control groups took part in the study. In the experimental groups, the participan...

Our research concerns formal, expressive, objectcentred languages and tools for use in engineering domains for planning applications. In this paper we extend our recent work on an object-centred language for encoding precondition planning domains to a language called OCLh, designed for HTN planning. Domain encodings for HTN planners are particularly troublesome, because they tend to be used in ...

Many different task modeling methods exist. In this paper, we discuss 1) ingredients common to most task models, 2) how task modeling relates to the design of user interfaces, and 3) our proposed ontology for task analysis. We then show our task analysis tool that is based on the ontology. It is our belief that task models should be based on an ontology that describes the relevant concepts and ...