VIABLE PARAMETERS
Usability Usability means developing products and systems easier to use. These products have to correspond closely to user needs and requirements. It should be effective, efficient and satisfactory.
Affordable for user group An affordable product is one that is economically viable for the target group you are designing. Making it affordable means that it will have a real selling-buying life in the market.
Create business models (along the value chain) A successful business model represents a better way than the existing alternatives. It may offer more value to a discrete group of customers. Or it may completely replace the old way of doing things and become the standard for the next generation of entrepreneurs to beat.
Open to future improvements It is to design your project thinking that it will solve a specific need in a specific date/time. It is also thinking that the needs will evolve. Your product eventually could be asked for some future changes to become a better product according to the new context.