In the words of Dieter Rams, one of best Industrial designer produced by Germany, there are ten sacrosanct principles that go into making a good product design. These ten principles are as follows:

Innovative

Inovative design always develops in tandem with innovative design technology and as such can never be an end in itself.

Makes a useful product

Emphasises the usefulness of a product while disregarding anything that could possibly detract from it

Makes a product understandable

Makes the product clearly express its functions by making use of the user’s intuition. The design at its best should be self-explanatory.

Aesthetic

Integral to its usefulness because products are used everyday and have an effect on the people and their wellbeing. Only well executed objects can be beautiful

Unobtrusive

Neither decorative nor works of art. Design should therefore be both neutral and restrained to leave room for the users self expression.

Honest

Doesn’t make a product more innovative, powerful or valuable than it really is. It doesn’t attempt to manipulate the consumer with promises the product can’t keep.

Long Lasting

Avoids being fashionable, therefore never becomes antiquated. Good design is meant to last several years, even in today’s use and throw culture.

Thorough Down to the Last Detail

Nothing is arbitrary or left to chance. Care and accuracy in the design process show respect towards the consumer.

Environmentally Friendly
Makes an important contribution towards the preservation of resources and minimises physical and visual pollution throughout the life cycle of the product.

As Little Design as Possible

Less, but better – because it concentrates on the essential aspects and the products are not burdened with non essentials. Good design takes the products towards wholesome purity and simplicity.