The main function of my project is to provide a means by which I can measure progress. It will therefore have to provide resistance when it is used, and have an indicator, which when force is applied to the product will light up. Safety Safety is a very important factor in technology of any kind. Toxicity My product must not be toxic or poisonous in any way.

I should use a material that is not made with any chemicals that could damage the skin or enter the bloodstream. Sharp Corners and Edges As the product I am looking to make will be held in the hands I can not use a material or shape that will be sharp or pointed. To avoid damage and injury I should make the product rounded and absent of any corners or edges were possible. Materials My product will have to be made from a material that will not crack or break under pressure it must be durable. Each of the materials available to me have their own properties and limitations, therefore I must choose those materials which are suitable.

Cost The cost of raw materials and of production equipment should not be too expensive. Size and Weight The size of my finished product must not be overly large. It must neither be too heavy as I must be able to store it easily and also carry it around easily. Appearance The appearance of my product is a very important factor, which I have to take into consideration. The appearance of my finished product is one of the first features that most people will notice.

I should try and keep the product pleasing to the eye, yet suited to the purpose and environment for which it is being produced. Ergonomics Ergonomics is the study of man in relation to his work and his environment. The finished product should be of an appropriate size and shape. If for example I was designing a chair I should not make one that was twice a man's size or one that was too small too sit on.

I should produce it so that it is comfortable and provides support. The same applies for my product I should not produce something too large to hold or too small to hold.