How would you identify and compare different types of evidence when making your assessment decisions

In simple terms you identify different types of evidence
during the planning process with your
candidate ie you look at how she is going to
provide evidence
1. By you observing
2. By you providing a candidate reflection
3. By obtaining witness statement
4. By you asking her questions.
You compare these different types by assessing
their strengths eg. No 1&4 would be strong
evidence as you are the assessor making the
judgment. No 3 would be strong or weak
depending who was
types of evidence