The three key {TESS+} services are 1) normative services, 2) field support services, and 3) operational process support. The services are described in more detail below.

1) Normative services:
A- Standards design: {TESS+} produces global technical and procedural (security) standards and guidance for the UNSMS through the design, testing and adoption of current and future technologies ensuring a standardized and well-adopted fit-for-purpose SCS architecture. This includes designing standards on currently used technologies in the UN SCS.
B- Standards documentation: {TESS+} ensures that UN SCS standards are adequately documented through global standards documents, manuals and training material designed for field technical support personnel, security personnel, and users and operators of the UN SCS.
C- Assessment and monitoring: {TESS+} assess existing field SCS and recommends concrete improvements through remote support and in-country missions. {TESS+} continuously monitors the status of the SCS recommendation implementation, and the overall status of the UN SCS in each country were are working with.

2) Field support services:
A- Standards implementation support: {TESS+} provide remote and onsite technical guidance, training and capacity strengthening to support the field-based UNSMS to implement SCS assessment recommendations.
B- On-demand support: {TESS+} provides remote and onsite technical support to resolve more complex technical or procedural SCS issues to support the local team.

3) Operational process support:
This is not a key service delivery but defines how the {TESS+} operations are organised in order to deliver the key services.
A- At a global level: facilitate and operationally coordinate all {TESS+} global services in close collaboration between the SCS technical service providers (UNICEF, UNHCR, OICT/DOS, WFP and ETC) and the main service clients (UNDSS, IASMN, NGOs –represented through the ETC).
B- At a field level: facilitate and operationally coordinate all {TESS+} field services, in close collaboration with the UNSMS and the technical service providers at local, regional and HQ level.

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The key business requirement for {TESS+} as per the {TESS+} service charter is to provide continuous guidance and support on the security telecommunications system for the UNSMS and NGOs.

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{TESS+} service layers:

{TESS+} key services are based on three service layers. Each layer builds on top of the other starting from the connectivity layer:
A- Connectivity layer: this layer defines the connectivity, the hardware components of the SCS, providing reliable telecommunications tools supporting staff security and safety.
B- Applications layer: based on the connectivity layer, this element, the software or data components of the SCS, defines which applications should be used.
C- Procedures layer: based on the previous two technological layers, this element defines and supports the UNSMS security and safety procedures and policies needed to ensure the technologies are properly translated into standardized tools used by the UNSMS.

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