The corrective action log in general contains a unique identification (e.g., number or code), the description of the non-conformity, identification of similarly identified nonconformities, actions to be implemented, and identification of approver and implementer.
If you need evidence of the actions that follow, at least the following information needs to be recorded:
the nature of the nonconformities and actions taken
the results of corrective actions performed
For example, if the nature of the nonconformity is about lack of competence, the proposed action could be training, and the results to be recorded would be certifications, attendance lists, or interviews with employees about the training topic.
This article will provide you with a further explanation about corrective actions: