Table 3

Task usability results: effectiveness, efficiency (task observations) and satisfaction (task interviews)

Task/feature

N

Effectiveness

n

Efficiency

n

Satisfaction

n


Task 1

20

Effective

19

Efficient

11

Satisfied

17

Register

Partly efficient

8

Neither satisf./dissatisf.

2

Partly inefficient

0

Dissatisfied

1

Inefficient

1

Task 2

12

Effective

10

Efficient

3

Satisfied

3

Ask a question

Partly efficient

5

Neither satisf./dissatisf.

7

Partly inefficient

2

Dissatisfied

2

Inefficient

2

Task 3

12

Effective

11

Efficient

5

Satisfied

9

Search answer by words in search function

Partly efficient

4

Neither satisf./dissatisf.

1

Partly inefficient

2

Dissatisfied

2

Inefficient

1

Task 4

20

Effective

19

Efficient

3

Satisfied

7

Search answer by category

Partly efficient

5

Neither satisf./dissatisf.

8

Partly inefficient

11

Dissatisfied

5

Inefficient

1

Task 5

12

Effective

11

Efficient

3

Satisfied

7

Technical help from moderator or help function

Partly efficient

4

Neither satisf./dissatisf.

3

Partly inefficient

4

Dissatisfied

2

Inefficient

1

Task 6

8

Effective

8

Efficient

3

Satisfied

3

Register as expert

Partly efficient

1

Neither satisf./dissatisf.

2

Partly inefficient

4

Dissatisfied

3

Inefficient

0

Task 7

8

Effective

8

Efficient

6

Satisfied

6

Answer a question

Partly efficient

2

Neither satisf./dissatisf.

1

Partly inefficient

0

Dissatisfied

1

Inefficient

0

Task 8

8

Effective

8

Efficient

5

Satisfied

6

Add a supplementary answer

Partly efficient

3

Neither satisf./dissatisf.

2

Partly inefficient

0

Dissatisfied

0

Inefficient

0


Participants (N = 20) are questioners from the working population (N = 12) and experts (N = 8). Questioners executed Tasks 1, 2, 3, 4 and 5. Experts executed Tasks 1, 4, 6, 7 and 8.

Rhebergen et al. BMC Medical Informatics and Decision Making 2010 10:63   doi:10.1186/1472-6947-10-63

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