Concept design is used to identify project technical and economic feasibility and to set out guidelines for basic and detailed engineering development. This is based on a previous study (feasibility study) and on the definition of project requirements.

The main concepts analysed and studied in this phase are:

• Products and production capacity
• Standards and regulations
• Manufacturing process description and user requirements
• General installation description.
• Plot plan, block diagrams, room distribution, personnel and materials flow diagrams, classified area drawings, basic process diagrams
• Requirement estimates for auxiliary services
• Preliminary equipment list
• Economic investment estimate, ± 30%

In order for this phase to be successful, TPRO has to fully assimilate the customer's requirements, which means that the involvement of the latter is essential right from the very beginning of the project. A joint customer/TPRO work team is therefore established with experts from both parties.