Keystroke Level Modeling: Usability's Next Top Model
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Presented at the 2011 Usability Professionals Association Conference in Atlanta
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Keystroke Level Modeling: Usability's Next Top Model
- 1. Tool Time - Usability’s Next Top Model: KEYSTROKE LEVEL MODELING Michael Rawlins, President, Connecticut UPA Lori Hawkins, Sr. UX Consultant, Usability.org Jeff Sauro, measuringusability.com June, 2011
- 2. Why this topic We’re all striving towards more agility in the development lifecycle... Shrinking budgets inspire innovative solutions using new tools. Stakeholders need proof ‘earlier’ in the lifecycle... KLM is an early indicator - providing more precision in our baselining and heuristics. 2
- 3. Why explore this tool? Time to market – an increasing issue for product development Cost of large samples no longer feasible Collaborative - even a Product Manager can use this tool! Level-set - The traditional lab & observation techniques are not dead... Perhaps newly augmented by leaner tools like KLM.
- 4. Proof... “KLM is your Canary in the Coal mine...” 4
- 5. Session Goals... What this tool accomplishes. KLM’s Significance in the development lifecycle. Where best to apply... We’ll leave a lot of time for Q&A... 5
- 6. What is KLM? Developed in 1983, KLM is a tool that provides an estimation of keystrokes associated to data input tasks. Best suited for modeling tasks less than five minutes to complete Based primarily on modeling a sequence of operations (K, P, B, H, M, T, W) 6
- 7. Operations Operator Characteristic Estimation K key press and release keyboard P point the mouse to an onscreen object 1.10 seconds B button press or release 0.10 seconds H hand from keyboard to mouse 0.40 seconds M mental preparation 1.20 seconds T(n) type a string of characters (n* K seconds) W (t) user waiting for the system to respond 7
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- 27. A Business Case... Booking a multi-city trip with Amtrak 27
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- 31. How to Apply… Select a working prototype Identify time-to-task goals from stakeholders Identify main goals and sub-goals Determine happy path (and analyze) Investigate other paths... Share with stakeholders “are we directionally correct...”
- 32. Pros… forget about the stop watch! quick and extensible share task with your stakeholders
- 33. Cons... spreadsheets can be intimating changing time estimates on operators may require some level of research Mitigation: Composite KLM tool 33
- 35. You can contact us: michael.rawlins@gmail.com Questions… jeff@measuringusability.com lori@usability.org
- 36. Thank you…