• Parts can be reused: Once created, a part can be used in different assemblies without needing to be redesigned.
• Good for collaboration: Different team members can design different parts at the same time.
• Simple and organised: Each part is kept separate, making the design process more straightforward and easier to manage.

Disadvantages of Bottom-Up Modelling

• Better fit between parts: Allows sizes to be captured from another part without measuring, making the model accurate.
• Easier to make changes: If something in the design changes, related parts can automatically update to match.
• Great for complex designs: Allows geometry (the shape of something) to be captured without redrawing making it faster to model 

• Parts can be based on shared geometry or features: You can create parts that share edges, faces, or dimensions with other parts, which helps maintain consistency and accuracy.

Disadvantages of Top Down Modelling