There are four Level 3 Assessor qualifications aimed at people working in assessment. They cover how to plan, prepare, conduct and gather evidence for assessment:
Level 3 Certificate in Assessing Vocational Achievement
This NVQ Certificate is the only qualification that will qualify you to assess learners in the workplace and in learning environments (classrooms, workshops and virtual learning environments). It also qualifies you to use the full range of assessment methods.
This qualification was formerly known as the A1.
Level 3 Award in Assessing Competence in the Work Environment
This NVQ Award is for those who assess competence in the workplace only and using the following assessment methods: observation/examining work products/oral questioning and discussion/use of witnesses/learner statements/Recognition of Prior Learning (RPL).
Level 3 Award in Assessing Vocationally Related Achievement
This NVQ Award is for those who assess competence in training environments only and using the following assessment methods: assessments in simulated environments/skills tests/oral and written questions/assignments/projects/case studies/RPL.
Level 3 Award in Understanding Principles and Practice
This Award is a theory-only qualification aimed at those beginning an Assessor role and those who need to know about assessment practice but who are not practising, such as those who wish to become Assessors, quality assurance staff or managers.
Here is more detail on the Assessor qualifications.
For details of the full set of Assessor qualifications, units and standards, please visit here.