Running any project successfully requires integration between the processes for each of the engineering design, the engineering project management, and methods of execution for the proposed project. Al-Qal'ah region, located at Amman downtown, is a national historical site that has been exposed to continuous erosion of side slopes and ground instability. This can be attributed to a number of factors, prominent among which are environmental and climatic conditions, in addition to the existence of different slope characteristics at this region which govern the behavior of these slopes and consequently have considerable effects on the overall stability of this site. The major aim of this research is to conduct detailed geotechnical and management investigations for the side slopes adjacent to the archaeological site of Al-Qal'ah region, and accordingly to suggest the most appropriate solutions that can be adopted to protect and develop the study area. The geotechnical part investigated the engineering evaluations for the study area, in addition to proposing and designing a number of engineering alternatives to be performed in developing the overall study area and achieving the required slope stability of this region. Thus, three alternatives are proposed as the most suitable and applicable for protecting and developing the faces of the existing side slopes of the study area, namely gabion retaining wall, reinforced concrete retaining wall, and gravity retaining wall. In the management part of this investigation, the phases of construction project management were identified. Then the most appropriate and optimal alternative was chosen after conducting the development of the project plan required for each alternative. The cost and duration needed for carrying out each alternative were determined using Primavera Software and calculating the NPV for all alternatives. The findings of this research revealed that gabion retaining wall proves to be the best alternative in terms of cost, duration, NPV and safety for developing and protecting the first zone of the area under study compared with the other suggested alternatives. As for the second zone, the side slopes can be developed and protected using riprap. In addition, a new sidewalk was proposed to be carried out for the study area. In general, the above suggestions revealed to be helpful in improving the study area, and strengthening the overall stability of the site.