Question $1$

a$.$ Why do we need design patterns?

b$.$ List and explain, $2$ for each, creational pattern, structural pattern and behavioural pattern

Question $2$

Azarai Metals is a jewellery shop that aims to provide an online shopping experience for its customers. The platform will enable users to browser products, add items to their cart, make purchases and manage their e$-$wallets$/$accounts$.$ The system will have various actors interacting with different functionalities.

a$.$ Identify all the actors in the scenario and draw the use$-$case diagram capturing all the user and system interactions. Make sure to incorporate relationships within the cases in your systems.

b$.$ How can this system be broken into different components. Illustrate this with the component diagram and a fa$$ade pattern to capture external system calls.