What do we understand by clash detection and how is it useful? It is really important that design errors and time based clashes are determined by AEC professionals much earlier than actual construction as they can be responsible for creating expensive rework. Apart from being accountable for increasing project cost rework also delays the project deliveries which annoy clients greatly. So to avoid all these situations it is important to execute clash detection which successfully identifies all kinds of clashes. Execution of construction projects is not a one man’s game in fact multidisciplinary design and construction teams with their own technical expertise are involved in it. And hence it becomes mandatory that the output produced by individual teams must be examined for its accuracy and validity. Until and unless the designs of different building disciplines that are produced in the form of 3D models are checked for their preciseness in terms of information captured in them, it won’t be intelligent to consider them for final construction. So to identify conflicts between models elements remain at the heart of project execution process. Conventionally when BIM software such as Navisworks was not available to design and construction professionals they used to invest countless hours for detecting clashes. And the fact remains that too much efforts also never used to provide effective outcomes. Manual clash detection never used to be successful in eradicating the errors thoroughly, there still used to be clashes and providing solutions to them when actual construction is already half-way was really difficult. Various kinds of clashes such as conflicts between the model elements of 3D models used to be quite common. For example pipes often used to intersect HVAC duct which used to come across in their way. Apart from design clashes, time based clashes are also common when clash detection process is not executed. For example, if a vehicle is required for two different tasks at the same time it is considered as schedule based clash. Design based clashes can be sorted out by conducting clash tests in Navisworks wherein conflicts between different model elements are figured out and then resolved. This is tremendously crucial for seamless construction.