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BMI+211+01.12.10

BMI+211+01.12.10 - Effective Design in Clinical Informatics...

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Effective Design in Clinical Informatics BMI 211/CS 271 Amar Das Assistant Professor Medicine (Biomedical Informatics)
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Announcements First homework out on January 15 and due January 22 Groups should be finalized this week and a project area selected
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Course Lectures Week 2: Requirements analysis Week 3: Functional specification and design Week 4-6: System architecture Week 7-8: Human-system interaction Week 10: Industry perspectives
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System Design Technical Model User Model System Interface
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Requirements Analysis What is the problem to be solved? The what rather than the how What methods exist? Why is it hard?
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Approaches Personal experience Software requirements Focus group or user survey Task analysis Field study
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Approaches Personal experience Software requirements Focus group or user survey Task analysis Field study
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Software Requirements Problem Needs Features Software Requirements Problem Domain (What) Solution Domain (How) Use Case Modeling, Bittner & Spence, 2003
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Software Requirements Functional (behavioral requirements) Actions that a system must be able to perform Specify the inputs and outputs of the system Nonfunctional (developmental quality) Related to the ‘ilities’ of the system: usability, reliability, and maintainability
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Involving Stakeholders Identify the stakeholders “An individual who is materially affected by the outcome of the system” Identify the stakeholder types Organizational roles Ambassador user vs. executive sponsor Technology adopters vs. standard users
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Involving Stakeholders Stating the problem (simplified) The problem of what [describe problem] Affects [stakeholders] The result of which is [impact of problem] A solution would [key benefits] Use this approach for first project presentation
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Limitations of Approach Eliciting a complete set of requirements from users is challenging Decomposing the problem and organizing the information Communicating the problem Resolving conflicting needs Knowing when to stop
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Why is Requirements Analysis Hard? Different types of requirements to address (needs vs. features) Requirements are constantly changing Often the requirements of the context of use is missed
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Approaches Personal experience Software requirements Focus group or user survey Task analysis Field study
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User Survey Study (Stevens et al., 2001) Working biologists (experts) in academia and industry General questionnaire and interviews What tasks do you commonly perform?
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