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1. What is Service Request Management In terms of ITIL 4.
-> As per BMC Docs "The BMC Service Request Management application enables an IT department and other business departments to easily define available services, publish those services in a service catalog, and automate fulfillment of those services for the user community, enabling users to help themselves. You can refer https://docs.bmc.com/docs/srm91/home-609064772.html for more details.
2. what is service request and how it is different from Service Request Management and Service Desks.
-> Service request in basic terms means offering which business offers to its user using SRM module. Service Desks is altogether different module which includes Incident Management, Problem Management, Asset & Knowledge Management.
3. What is Service Level Management how it is differs from Service Level Agreements.
-> Service Level Managament is different ITSM module which manages agreements. There are 3 types of agreements namely, Service Level Management (SLA), Operational Level Agreement (OLA), Underpinning Contract (UC). You can refer Agreement types - Documentation for BMC Service Level Management 9.1 - BMC Documentation BMC Service Level Management overview - Documentation for BMC Service Level Management 9.1 - BMC Documentation
I believe ITIL Foundation document will provide you more detailed information on all this.
Thank you Ankit