The methodology adopted for generating, sifting and developing the options should be described clearly and concisely in the STAG Report. In addition, all options generated, the do-minimum and any reference case should be described in full.
If options are rejected at the Option Sifting phase, the reasons for rejection should be briefly and clearly outlined. This may include identifying inconsistencies between options and Transport Planning Objectives.
In summary, the methods by which the Option Generation, Sifting and Development process is carried out must be comprehensively documented, with a clearly defined audit trail.