Encourage exploratory learning (Undo)

0

4

2.23

0.178

1.179

1.389

Prevent serious errors. (Undo)

0

4

2.30

0.154

1.025

1.050

Use standard meanings of words (Language)

0

4

1.82

0.179

1.187

1.408

Specialized language for specialized group (Language)

0

4

2.14

0.171

1.133

1.283

User defined aliases (Language)

0

4

2.23

0.178

1.179

1.389

Users’ perspective (Language)

0

4

1.55

0.157

1.044

1.091

Users are initiators of actors (Control)

0

4

1.77

0.159

1.054

1.110

Avoid surprising actions (Control)

0

4

1.91

0.141

0.936

0.875

Context-sensitive help (Documentation)

0

4

2.23

0.175

1.159

1.342

Help embedded in contents

0

4

2.30

0.161

1.069

1.143