Table 1 Scale information for experts

Relevance

Clarity

1. Item not relevant to the domain

1. Item is not clear to the domain

2. Item is somewhat relevant to the domain

2. Item is somewhat clear to the domain

3. Item is relevant to the domain

3. Item is clear to the domain

4. Item is very relevant to the domain

4. Item is very clear to the domain

Simplicity

Ambiguity

1. Item is not simple

1. Doubtful

2. Item need some revision

2. Item need some revision

3. Simple but need minor revision

3. No doubt but need some revision

4. Very simple

4. Meaning is clear