Table 1.

Summary of the measurement items

Items	Measurement	Cronbach’s α after item deleted	Source
U1	If you have questions on interactions and contraindications of drugs: How do you inform yourself at first? (look at the poster/look at the pocket- checklist/use the electronic medication check/ask colleagues/look at the “red list” (print version)/others -please specify)	--	self- development
U2	Have you gotten a briefing regarding the usage of the measures? (yes/no)
U3	How often do you use the measures in your daily routine? (not at all/monthly/weekly/once a day/several times a day)
U4	In case of a critical drug order: To what percentage do you use the measures? (not at all/up to 10%/up to 25%/up to 50%/up to 100%)
U5	When have you used the measure for the last time? (never use/today/…days before)
U6	Which information sources do you usually use when checking medication electronically? (infobutton/checkbox “indication for drug known”/OntoDrug/PharmIndex/checkbox “ADE”/use no source)
U7	In which situations do you use the computer-assisted medication check? (open- ended)
U8	Previous field observations indicated that measures have not been used often. What can be the reasons for low usage in your opinion? (open-ended)
U9	What should be improved so that measures are used more frequently? (open-ended)
PU		0.882	PU1- self- development; [35]
PU1	Medication safety measures basically make sense.
PU2	The measures could increase my productivity.
PU3	The measures could improve the quality of care.
PU4	The measures could enhance my effectiveness.
PU5	The measures could be useful in my job.
PEOU		0.949	[35]
PEOU1	My interaction with measures is clear and understandable.
PEOU2	The measures are easy to use.
PEOU3	Interacting with measures will not require a lot of mental effort.
PEOU4	It will be easy to get measures to do what I want them to do.
SN		--	[35]
SN1	Physicians who influence my behavior think I should use the measures.
IM		0.881	[35]
IM1	Having the measures is a status symbol.
IM2	Physicians who use the measures have more prestige than those who do not.
IM3	Physicians who use the measures have a high profile.
JR		0.869	[35]
JR1	Usage of the measures is relevant to the delivery of patient care.
JR2	Usage of the measures is important to the delivery of patient care.
OQ		--	[35]
OQ1	The quality of drug information is high.
RD		0.860	[35]
RD1	The measures could reduce the costs of my care delivery.
RD2	I believe I can communicate to others the consequences of using the measures.
RD3	The results of using the measures are apparent to me.
RD4	I have difficulty explaining why using the measures may or may not beneficial.
COM		--	[40]
COM1	Using the measures fits well with the way I work.
RTC		0.860	[39]
RTC1	I don’t want the measures to change the way I order patient medication.
RTC2	Overall, I don’t want the measures to change the way I currently work.
VO		--	[23]
VO	Use of the measures is voluntary.
ITU		1.000	[35]
ITU1	Assuming that significant barriers to the use are overcome, I intend to use the measures.
ITU2	If significant barriers did not exist, I predict I would use the measures.
General Suitability
GLO1	How suitable do you judge the measures (training/poster/checklist/infobutton/checkbox “indication for drug known”/OntoDrug/PharmIndex/checkbox “ADE”) for emergency department? (5-point rating scale ranging from 1 = least suitable to 5 = above all suitable)	--	self- development
DG1	What is your professional status? (senior physician/specialist in internal medicine/junior doctor)	--	self- development
EXP1	How long have you been working as a physician? (for…years)
EXP2	How long have you been working with electronic patient records? (for…years)
EXP3	How do you rate your computer skills? (low/moderate/high)