BIM is a process that allows members of the project team to collaborate on the design elements of a 3D architectural model via a computer virtual platform. Architects, engineers, planners and the construction team have to analyze the digital model and provide their technical expertise with a goal of conforming their inputs in relation to the model, specifications, regulations and other fields of expertise which are part of the project as a whole.
BIM allows incompatible elements across the model to be rectified before building commences, thus saving the client a lot of money and reducing disputes which normally arise during the construction phase. In this regard BIM may be used as a tool to assess the feasibility of a project in the planning/design stage, because it allows the project team to have a walkthrough inside the virtual model and inspect the elements.
Quantity surveyors are also part of the project team, and their major concern is the cost of the project. Fortunately, BIM does not need an estimator to measure and quantify the building elements. The virtual software does this automatically, through automatic take-off of the project 3D Model geometrics. However, when a quantifying function or auto-measurement capability is not included on BIM software, you have to look for construction quantity takeoff software that allows integration with BIM.