4D modeling as planning tool will become one of the convenient tools for construction and project management as the author explains. The discourse is, however, very generic and contains no new perspective how the 4D model will benefit the AEC industry. Particularly the model used for the case study is quite simple and even without 4D program CM can identify the optimum solutions. In addition, because the case studies do not describe how the 4D model optimized the sequences, the effect of the 4D is uncertain. In the real world, the building information model (BIM) draws a lot of attention and if the 4D model were integrated w/ the BIM it may be a potential tool to streamline the programming process.