Public sector
Federal and Flemish agencies running framework contracts with multiple system integrators. SIAM gives you the oversight evidence your inspector general expects.
Service · SIAM as Independent Integrator
SIAM: the integration layer your multi-vendor IT needs.
We act as your independent SIAM integrator, sitting between you and your suppliers, governing the end-to-end service, and staying through run. No tooling lock-in. No supplier we secretly want to protect.
Founder Member of the Scopism SIAM Directory.
Xedis is listed as a Founder Member of the global Scopism SIAM Directory — the reference community for organisations and practitioners shaping how Service Integration and Management is defined, taught and applied.
01 / Why now
Hybrid IT broke the single-supplier model.
SIAM is the discipline that puts the client back in control of a multi-vendor estate, without taking the work back in-house.
- You have 4+ suppliers, but no one owns the end-to-end service.
- Tickets bounce between vendors. Time-to-resolve is rising.
- Your largest supplier also acts as integrator, making independent governance difficult.
- Cloud, legacy and managed services don’t share a single service model.
- Audit findings on supplier oversight (NIS2, DORA) are stacking up.
02 / The role model
Independent. By design, not by accident.
We don’t sell towers. We don’t resell tooling. That independence is why our SIAM design holds up under audit, and why suppliers accept the governance.
Retained organisation
Owns strategy, demand, budget and outcomes. Stays small and senior.
Independent integrator (SIAM by Xedis)
Governs the end-to-end service. Owns process, data, escalation, supplier performance.
Service providers
Deliver towers (cloud, network, apps, EUC, security). Accountable on SLAs that finally connect.
03 / Build & run
We don’t hand over a slide deck and leave.
Build
Design the integration layer
- Service model & supplier landscape map
- Process design across incident, change, problem, request
- Tooling architecture (ITSM-of-record + supplier exchange)
- Governance forums, RACI and escalation paths
- Contract & OLA alignment with existing supplier contracts
Run
Operate it as a service
- Service integration management (SIM) team, embedded or remote
- Supplier performance management with monthly service reviews
- End-to-end incident & major-incident coordination
- Continuous improvement backlog with measurable outcomes
- Audit-ready evidence for NIS2 / DORA supplier oversight
Enablement · Business simulation
Hollywood Dreams — SIAM Business Simulation
SIAM is easy to nod along to and hard to actually feel. The Hollywood Dreams simulation fixes that. In a single facilitated session, your leadership, retained IT, business stakeholders and supplier managers live through a multi-supplier film production — and see for themselves why integration, clear roles and end-to-end governance are the difference between chaos and a working service.
It is the fastest way we know to get everyone on the same page, turn the sceptics into sponsors, and make the value of SIAM obvious — without a single slide.
About Hollywood DreamsWhy run it
- Turns SIAM sceptics into sponsors — people feel the value, they don't just hear it.
- Gets leadership, retained IT, business and suppliers on the same page in one session.
- Makes the case for integration, clear roles and end-to-end governance obvious.
- Safely exposes today's multi-supplier pain before it hits the real service.
04 / What you get
More than just a SIAM operating model on paper.
End-to-end
Single accountable view across all suppliers
Audit-ready
Supplier oversight evidence for NIS2 & DORA
Lower MTTR
Major incidents coordinated by one team
Vendor-neutral
Decisions taken on outcomes, not loyalty
05 / Where SIAM fits
Built for organisations that can’t afford supplier ambiguity.
Utilities & infrastructure
Grid, mobility and infrastructure operators with OT/IT convergence and a long supplier tail. SIAM keeps safety-critical services accountable across vendors.
Enterprise & financial services
Large enterprises under NIS2 / DORA pressure, with hybrid cloud and legacy estates. SIAM turns supplier oversight from a yearly scramble into a monthly cadence.
06 / Client story · Belgian Defence
Designing and building an independent SIAM layer for Belgian Defence.
Across corporate IT, in a complex multi-supplier environment, we are designing and building the SIAM layer so Defence can integrate, govern and steer its suppliers as one hybrid organisation. Engagement ongoing.
Discuss your SIAM context“Xedis sits next to us, not next to a supplier. That’s why the governance works.”
Belgian Defence · Corporate IT
07 / SIAM readiness
Not sure if SIAM is the right next step?
Our 20-question readiness assessment helps you score your multi-vendor governance across five dimensions, service model, tooling, processes, contracts and audit posture, in under fifteen minutes.
Request the SIAM readiness PDF
We send it by email within one working day. No marketing follow-up unless you ask for it.
08 / Frequently asked
The questions IT leaders actually ask us.
We operate between your retained organisation and your suppliers. We build the service model, govern the end-to-end processes, manage supplier performance, and own the audit-ready evidence trail, as a vendor-neutral partner.
09 / Stories behind the expertise
SIAM never travels alone.
Supplier integrationEnd-to-end service levels across the digital-meter chain.
Fluvius runs Flanders' digital-meter rollout through a long chain of external suppliers — from the meter itself, through data capture, up to the energy-market business. The question was simple and hard: what service levels can we commit back to the business, and how do we hold every supplier to them?
What we didSupported the long-term partnership and RFP set-up, then designed the business control centre with back-to-back SLAs across the supplier chain.
Outcomeend-to-end service levels Fluvius can commit back to the energy-market business, with a control centre that removes finger-pointing across suppliers.
SIAMDesigning and building a SIAM layer, properly.
We are designing and building the SIAM layer for Belgian Defence. From operating model and governance design through to implementation, Xedis is helping to create the foundation for a multi-supplier IT environment that works as one.
What we didDesigned the SIAM service delivery model, governance architecture and roadmap. Defined the service integrator role, process model and tooling model as the foundation for integrating, governing and steering suppliers in a hybrid organisation.
Outcomea clear SIAM foundation that enables Belgian Defence to structure, govern and coordinate a complex multi-supplier IT environment with stronger ownership, clearer roles and better control across suppliers.
Ready to put a true integrator next to your business?
A 30-minute discovery call. No deck. No sales pitch. Just an honest read of where SIAM would, and wouldn’t, help you.
Book a Discovery Call