What points a Design engineer should consider while Designing?

Points to be considered in designing.

1. Design should fulfill the requirement of the  application for which the product is designed. 

2. Optimized design considering the worse scenario during operation with factor of safety.

3. Manufacturing feasibility of the designed product.

4. operation and maintanance ability.

5. Human and Environmental safety.

6. Cost Effective.

It depends on what kind of structure you are designing

Factors to be considered for designing a product depends entirely on what you are designing.

-Generally, we need to find how safe the design is (factor of safety) in terms of loads it is supposed to handle.We need to make the design optimally safer (without adding too much material which contributes to cost of manufacturing and many post manufacturing steps).

-The design should also show integrity when it is operated under different external conditions.

For example, a valve should operate safely under its designed load, but also it should not react with the fluid it is handling and the corrosive external factors like that faced in marine , nuclear or any other oxidizing atmosphere.

So material is chosen accordingly based on its strength and its external factors it is supposed to operate.

-Ergonomics to use is also given importance while designing a product. There are codes and standard to be applied while designing products of industrial application, especially.

Design should be ease to produce, assemble and maintain throughout its life cycle.  

it depends on what kind of structure you are designing for ex in case of building local conditions , requirments, countrys standard for desins,cost,etc

Thank you all for giving such a an informative answers.

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Dimensions,scale ratio,purpose of using the designing component ,previous data if available of that product.