Step 1: Building Information Modelling (BIM) is a digital representation of the physical and functional characteristics of a building. BIM typically includes several dimensions beyond the 3D model, such as time (4D) and cost (5D).
Step 2: The 4th dimension of BIM, often referred to as 4D, incorporates the construction schedule, helping to visualize the construction process over time. The 5th dimension, or 5D, involves the integration of construction costing, allowing for cost analysis and budget management throughout the project lifecycle.
Conclusion: The 4th dimension is the "Construction schedule," and the 5th dimension is "Construction costing."