Ten participants, who were experienced game players, took part in the experiment. During the experiment sensors were placed on the participants to collect physiological data. These included measures of the moisture produced by sweat glands in the hands and feet, and changes in heart rate and breathing rate. In addition, they videoed participants and asked them to complete user satisfaction questionnaires at the end of the experiment. In order to reduce the effects of learning, half of the participants played first against a friend and then against the computer, and the other half played against the computer first. Figure shows the setup for recording data while the participants were playing the game. The display shows the physiological data (top right), two participants, and a screen of the game they played. Results from the user satisfaction questionnaire revealed that the mean ratings on a 1–5 scale for each item indicated that playing against a friend was the favored experience in tabular form. Data recorded from the physiological responses was compared for the two conditions and in general revealed higher levels of excitement when participants played against a friend than when they played against the computer. The physiological recordings were also compared across participants and, in general, indicated the same trend. think about the case studies and reflect on the evaluation methods used. 1.For the case studies think about the role of evaluation in the design ofthe system and note the artifacts that were evaluated, when during the design they were evaluated, which methods were used, and whatwas learned from the evaluations. Note any issues of particular interest. You may find that constructing a table like the one that follows is a helpful approach. Name of the study or artifact evaluated   When during the design the evaluation occurred How controlled was the study and what role did users have Which methods were used   What kind of data was collected and how was it analyzed What was learned from the study Notable issues                 2.What were the main constraints that influenced the evaluation?

Ten participants, who were experienced game players, took part in the experiment. During the experiment sensors were placed on the participants to collect physiological data. These included measures of the moisture produced by sweat glands in the hands and feet, and changes in heart rate and breathing rate. In addition, they videoed participants and asked them to complete user satisfaction questionnaires at the end of the experiment. In order to reduce the effects of learning, half of the participants played first against a friend and then against the computer, and the other half played against the computer first.

Figure shows the setup for recording data while the participants were playing the game. The display shows the physiological data (top right), two participants, and a screen of the game they played. Results from the user satisfaction questionnaire revealed that the mean ratings on a 1–5 scale for each item indicated that playing against a friend was the favored experience in tabular form. Data recorded from the physiological responses was compared for the two conditions and in general revealed higher levels of excitement when participants played against a friend than when they played against the computer. The physiological recordings were also compared across participants and, in general, indicated the same trend.

think about the case studies and reflect on the evaluation methods used.

1.For the case studies think about the role of evaluation in the design ofthe system and note the artifacts that were evaluated, when during the design they were evaluated, which methods were used, and whatwas learned from the evaluations. Note any issues of particular interest.

You may find that constructing a table like the one that follows is a helpful approach.

2.What were the main constraints that influenced the evaluation?