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Analytical Evaluation with GOMS and KLM

Analytical Evaluation with GOMS and KLM. CS352. Announcements. Notice upcoming due dates (web page). Where we are in PRICPE : P redispositions: Did this in Project Proposal. RI : R esearch was studying users. Hopefully led to I nsights.

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Analytical Evaluation with GOMS and KLM

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  1. Analytical Evaluation withGOMS and KLM CS352

  2. Announcements • Notice upcoming due dates (web page). • Where we are in PRICPE: • Predispositions: Did this in Project Proposal. • RI: Research was studying users. Hopefully led to Insights. • CP: Concept and initial (very low-fi) Prototypes in Design Gallery #1. • Evaluate throughout, repeat iteratively!!

  3. GOMS (and KLM) • GOMS: a family of models. • Predict user performance. • Useful for predicting actual time a skilled user will take in UI. • Useful for comparing different UIs.

  4. GOMS Constructs • Goal, Operators, Methods, Selection rules • Goal: “what”. • Method: “how” steps (learned). • Operators: Cognitive processes + physical actions to DO it. • Selection rules: rules saying which method to select.

  5. GOMS example:Delete a word • Goal: delete a word in a sentence. • Method #1: use the menu • Recall that the word has to be highlighted. • Recall that the command is “cut”. • Recall that “cut” is in the Edit Menu. • Accomplish goal of selecting and executing “cut”. • Return: goal accomplished.

  6. GOMS example (cont.) • Method #2: use the delete key • Recall where to position cursor in relation to word to be deleted. • Recall which key is delete key. • Press “delete” key to delete each letter. • Return: goal accomplished. • Operators used in these methods • Click mouse, Drag cursor over text, Select menu, Move cursor, Press KB key, Think, ...

  7. GOMS example (cont.) • Selection rules: • Use mouse/menu method (#1) if there’s a lot of text to delete. • Else use “delete” key (method #2).

  8. KLM (a low-level variant of GOMS) • Keystroke Level Model. • Simple, but accurate. Widely used. • Scope: • skilled users • doing a task error-free. • using a specific method in a UI. • CogTool has this built-in.

  9. KLM Operators • User Operators: • K (keystroke), P (point), H (homing), D (drawing), M (mental: think). • Times for each are provided to you • based on extensive research/empirical data. • System Operator: • R (respond).

  10. KLM/GOMS example 1:Open a file • 27 ways to open a file in Windows! • Methods as states +transitions. • (High opgranularitycombineslow-level ops.)

  11. KLM/GOMS example 1 (cont.) • Used to: • Understand cost of each. • (break downparticipants actual costs). • “Rx”:recent lists. • “WS/WX”:search. • And to...

  12. KLM/GOMS example 1 (cont.) • Use the breakdowns to compare costs to new UI alternative (new feature “FP”) actual calc’d

  13. Comparison • GOMS/KLM vs. HE vs. CogWalk • how long it takes you to do • how much detail it gives you • about what kind of user • how much of the UI you focus on at once

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