To conduct an effective gap analysis for a company implementing ISO 9001:2015, you should:

1. Use a gap analysis tool for ISO 9001:2015 or the standard itself for a thorough analysis.
2. Have someone knowledgeable in your operations assess each requirement.
3. For each standard requirement, write down what you already do that addresses this requirement.
4. Generate a list of requirements you have not yet addressed in your company.
5. Plan to implement new processes and procedures to address these requirements currently missing from your QMS.