There are two different forms of cubism, synthetic and analytical. The two forms vary in many ways including how much a subject is reduced to cubist form and the use of "real life" materials - meaning textured materials.
Analytical Cubism looks at the idea of compression within subject inspection - looking at the subject from different angles and bringing all theses veiws together, then reducing and simplifying the element.
The painting PROCESS also plays a vital role in this form of cubism - seeing,movement,recognizing and understanding. Also the reduction of an element to the basic form.Picasso's
Daniel-Henry Kahnweiler is a great example of Analytical cubism
Synthetic Cubism looks at featured elements of collage, introducing textured materials/surfaces to the painting. The idea behind this is to connect/re-connect the painting with the real world. Elements of modern culture were also introduced, an example of this being newspaper clippings.
Picasso's Still Life With Chair Caning shows the use of textured materials in cubism - he used actual chair caning.