During this phase, the most promising and acceptable alternative is further elaborated and turned into a definitive action plan. The emphasis now shifts to 'how?'. Variants are investigated and worked out in detail, and their impact is assessed. Detailed plans and drawings are produced. Finally, the action plan is agreed with the public and private sectors. This commitment from relevant public and private bodies ensures that the alternative that has been developed can eventually be implemented and realized in practice. The specifications are updated. In many cases there is a need for more detailed and advanced models and tools.

Tools and techniques that can help the development of an Action Plan are:

• Role-plays
• Interactive Multi Criteria Analysis (MCA)