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Question 1 “ChenOne” is a chain of fashion stores owned by Chenab Group (based in Faisalabad, Pakistan). It

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Question 1  “ChenOne” is a chain of fashion stores owned by Chenab Group (based in Faisalabad, Pakistan). It offers clothing, footwear, bed linen and kitchen accessories. Chen One has its web site. A visitor may browse catalogues of its different products. A visitor may fill sign up form and can become a registered user. A registered user record will be maintained by company. A registered user (after Login) may do online shopping with free home delivery option. He will fill cart by selecting different products (along with different sizes and colors options). After order confirmation, a SMS with order details will be sent to customer. Receipt will be saved and customer may also check his orders(s) details later on. Ordered products will be delivered to customer at given address after cash payment.   
You are required to draw an ERD for above mentioned case study. Show entities, attributes and relationships (types of relationships not required).  
Question 2  How Prototyping can be used in Requirements Engineering?                                                Question 3 (a) What is meant by non-rigidity of the software development model?  (b) From following list, which SDLC models are non-rigid? Give justification of each in 2-3 lines.    i. Waterfall Model ii. Incremental Model iii. Spiral Model



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