The system should allow a user to enter customer details and select appropriate customers for a mailshot What is wrong with this requirement?

A business analyst wishes to show that a company wants to store information about different types of product. Some attributes are common to every product (for example; product name) but other attributes only apply to certain product types. For example, product material only applies to accessory products.
Which of the following constructs could the business analyst use to represent this on a class model?

Which of the following approaches is the variation of the Waterfall lifecycle that shows explicitly the link between the analysis stages and the testing stages?

Which of the following terms may be used to describe the attitude of a stakeholder who is NOT in favour of the project but is probably not actively opposed to it?

Which stage in the waterfall model is considered as several separate stages in the V model?