On a hot day, there's nothing more refreshing than a nice, cold cup of iced tea. But what about in the rainy season? How can a company like Nestea, which sells such summertime treats, increase its sales in the colder months and gain an edge over competitors like industry leader Lipton?

Nestea's usual approach of only using market trends to develop new products was not generating enough revenue. In addition, non-compete agreements from a joint venture between the parent company Coca-Cola and Nestle put further pressure on Nestea to stay away from soft drinks and hot beverages. Therefore, Nestea had to develop a new product that was unique in its field.

b) If Nestea has finally decided on a product direction, suggest design methods they can use to ensure their product is robust, reliable and environmentally friendly.