Through Life Support is the project management discipline that applies a Whole Life approach to managing system support and sustainability. At the front end it encompasses the Supportability Engineering that designs the support system, ensuring that the long term supportability, sustainability and cost impacts are accounted for, and then throughout the system life it continues to monitor, improve and adapt the support to the changing threats, operational requirements and environments.
Through Life Support can be applied to legacy systems as well as to new programmes, changing the support arrangements to suit new doctrines, e.g. the MODs Defence Logistics Transformation Programme (DLTP) that is moving the focus from traditional contracting for repairs and spares to contracting for availability and capability.

Initiatives such as the DLTP have placed the risk on non-MoD organisations for the delivery of support services. In order to respond industry has to develop a far greater depth of system and process knowledge of the key support cost drivers of their systems, to mitigate the risk that poor supportability will reduce profitability.

Examples that demonstrate Persides capability in Through-Life
Management include:
- ASTOR - Raytheon Systems Ltd Airborne Stand Off Radar. Persides provides full ILS management including LSAR management, technical publications management, and training management and the establishment of the Contractor Logistic Support (CLS) programme.

- FIST - Persides are responsible for Definition of the FIST Through Life Support Solution as well as delivery of the innovative FIST UOR support solution

- Lydian - Persides are involved in the Project Management, Supply Chain Management and Service delivery management for this service based programmme.












