ISO 27001 and ISO 20000

Answer: Besides a customer requirement, you also have to evaluate these two aspects:
- if there is any legal requirement such as laws or regulations that demands for this certification;
- if the benefits related to the ISO 20000 certification will be greater than the effort to implement it and maintained it.

If there is no applicable legal requirement, then you should consider if the benefits for your organization to certify against ISO 20000 to meet this client needs will be greater than effort and cost involved in the implementation and operation of a certified system.

These articles can help you evaluate your options:
- 5 key benefits of ISO 20000 implementation https://advisera.com/20000academy/blog/2016/02/09/5-key-benefits-of-iso-20000-implementation/
- How to implement ISO 27001 and ISO 20000 together https://advisera.com/27001academy/blog/2015/03/16/how-to-implement-iso-27001-and-iso-20000-together/