Why do ServiceNow implementations overrun?
Because the platform can express almost anything, and an organisation without a firm scope will try to express all of it. The configuration surface is enormous, the consultancy market around it is mature, and every department that hears about the project adds a requirement.
The result is a platform that is genuinely more capable than the alternatives and, frequently, less used — because the go-live keeps moving. A narrower platform that launched last quarter is delivering service management today.
The practical defence is to fix the first release at incidents, requests and a self-service portal, and to treat everything else as later phases with their own justification. Platforms scoped like TOPdesk enforce that discipline structurally.
How should you compare the licensing?
Count who needs access rather than who needs a full seat. Most organisations have a small number of full-time service desk agents and a long tail of second-line engineers, application owners and approvers who touch the system occasionally.
A licence model that charges full price for that tail produces workarounds — shared accounts, tickets raised on someone’s behalf, work tracked in email — and the workarounds are exactly where the process data leaks out of the system you bought to hold it.
Ask specifically about approver access, read-only access and self-service users, and model the cost at the number of people who should reasonably be in the system rather than the number you can afford.
What should sit next to the service desk?
Every organisation eventually needs something joined to the tickets, and buying it from the same vendor removes an integration that would otherwise need maintaining forever.
The four common answers are represented here: assets and licences (USU), endpoints (Matrix42), identity and access (Efecte), and cost (Serviceware). TOPdesk takes a different route and extends the desk sideways into facilities and HR instead.
Pick based on which of those you are currently doing in a spreadsheet. That is usually the honest indicator of where the next integration would have to go.