Which systems provide a single, cohesive platform?

Although (integrated systems, enterprise systems, customized systems) provide a huge advantage by integrating all business functions of an organization into a single, cohesive platform, they require a huge initial investment and are vulnerable to (server failures, data overflow, security threats).

I would say an ERP

An ERP (Enterprise Resource Planning) is an example of widely implemented business process management system software for organizations and industries. It allows these organizations to integrate all facets of an operation such as development, product planning, manufacturing and processing, sales and marketing into a single database and user interface.