Table 2.

Analysis of goal sequence and interaction strategy for Subject 2 Legend: 1–5 Decision points where interaction strategies were selected; A–D Goal states (tasks to complete)

# Goal State/Decision	Memory Recall	System Support	Comments
Open chart	Patient name – Match	Name list
Evaluate case Dose adjustment	General medical knowledge	Electronic chart, case description	Patient data on screen and in notes
1 Drip – DC / Reorder	DC/Reorder or new order? DS available? Which faster?	none	Strategy dependent on experience, skill
B Reorder drip	Procedural knowledge	Context menu
2 Bolus – New Order	PTT values near normal, bolus order also needed	n/a	Decision driven by medical reasoning
A New bolus	Procedural knowledge	Context menu	Order A cancelled
3 Heparin IV order set 4 Heparin IV individual orders	Order set is available, may be preferable to individual orders Individual orders may be simpler, include calculation	none none	Heuristic decision, no prior experience w set Previous decision reversed, set confusing
A New bolus B Reorder drip	Procedural knowledge Procedural knowledge	Dose calculation Context menu	DS triggers reminder Aborted – needs DS
5 Drip – New Order	New orders procedure triggers auto calculation	none	Also needs to cancel current drip order
-- Error Cancellation of the previous order also deleted the just entered but unsigned bolus order --
A New bolus	Procedural knowledge	Dose calculation	DS triggers reminder
D Sign orders		Sign button	Saves current orders
B New drip	Procedural knowledge	Dose calculation	Second attempt
C Order PTT laboratory	Corollary order	Reminder	Included in bolus DS
D Sign orders		Sign button	Saves current orders