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By Neville Stanton; et al
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Additional info for Human factors methods : a practical guide for engineering and design
When a numerical rating is required. Open-ended questions What did you think of the system’s usability? e. subjects compose their own answers. Closed questions Which of the following errors have you committed or witnessed whilst using the existing system? (Action omitted, action on wrong interface element, action mistimed, action repeated, action too little, action too much) When the participant is required to choose a speciﬁc response. Filter questions Have you ever committed an error whilst using the current system interface?
In its simplest form, observation involves observing an individual or group of individuals performing work-related activity. A number of different types of observational study exist, such as direct observation, covert observation and participant observation. Observation is attractive due to the volume and utility of the data collected, and also the fact that the data is collected in an operational context. Although at ﬁrst glance simply observing an operator at work seems to be a very simple approach to employ, it is evident that this is not the case, and that careful planning and execution are required (Stanton 2003).
Semi-structured Interview. When using a semi-structured interview, a portion of the questions and their order is pre-determined. However, semi-structured interviews are ﬂexible in that the interviewer can direct the focus of the interview and also use further questions that were Data Collection Methods 25 not originally part of the planned interview structure. As a result, information surrounding new or unexpected issues is often uncovered during semi-structured interviews. Due to this ﬂexibility, the semi-structured interview is the most commonly applied type of interview.