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Entering numbers: the computer science of the everyday

Entering numbers: the computer science of the everyday. Dr Paul Cairns Reader in Human-Computer Interaction. Aims. Computer Science of Everyday Things Number entry Regular expressions Human-computer interaction A taste of things to come. Number entry. To err is human….

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Entering numbers: the computer science of the everyday

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  1. Entering numbers: the computer science of the everyday Dr Paul Cairns Reader in Human-Computer Interaction CS Open Day, Paul Cairns

  2. Aims • Computer Science of Everyday Things • Number entry • Regular expressions • Human-computer interaction • A taste of things to come CS Open Day, Paul Cairns

  3. Number entry CS Open Day, Paul Cairns

  4. To err is human… • Very common device in NHS • Nurse entered 68 not 6.8 • Patient died next day • What actually happened? CS Open Day, Paul Cairns

  5. But it’s very rare, isn’t it? • People make mistakes • 10% of all admissions • 10% of those are potentially fatal • 40,000 per year in the US • Human error or poor design? CS Open Day, Paul Cairns

  6. Thinking about numbers • Think up 5 different numbers that plausibly you might enter into a syringe pump? • Concentrations • Volumes • Times • Rates • Explore the possibilities CS Open Day, Paul Cairns

  7. ISMP Guidelines • No trailing zeros (5 mg, never 5.0 mg) • Use leading zeros for doses less than one measurement unit (0.3 mg, never .3 mg) • Units • Font: 0•35 CS Open Day, Paul Cairns

  8. Regular expressions • Shorthand • Describe “strings” of characters • Three operations: • Sequence • Iteration, * • Optionality, | CS Open Day, Paul Cairns

  9. Examples • Let = “A”|… |“Z” • Num = “0”| … |“9” • LetLetNumNumLetLetLet • “Y” Num* CS Open Day, Paul Cairns

  10. Exercise • Can you come up with a regular expression for ISMP compatible numbers? CS Open Day, Paul Cairns

  11. RE and Syringe Pumps • Use RE to block invalid numbers • Exhaustive simulation of errors • Java, Mathematica • Halve the out-by-10 errors CS Open Day, Paul Cairns

  12. RE and Syringe Pumps • Use RE to block invalid numbers • Exhaustive simulation of errors • Java, Mathematica • Halve the out-by-10 errors • But we had to guess some bits CS Open Day, Paul Cairns

  13. Computer Science could help… • Device logs • Regular expressions • Simulations • Interface design CS Open Day, Paul Cairns

  14. Where to find out more • http://www.cs.swan.ac.uk/~csharold/ • Norman, Design of Everyday Things • Here CS Open Day, Paul Cairns

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