Notes

Analytical cubism - the early phase of cubism, chiefly characterized by a pronounced use of geometric shapes and by a tendency toward a monochromatic use of color.
synthetic - the late phase of cubism, characterized chiefly by an increased use of color and the imitation or introduction of a wide range of textures and material into painting.
Art historians distinguish between Analytical and Synthetic, signifying the progression of the Cubist movement. In the end, though, the time limits of Analytical and Synthetic are rather flexible. Works partly fitting the Analytical aesthetic were produced after 1912, and paintings with features of Synthetic Cubism date back to the start of the movement.
Picasso and Braque are considered the founders of Cubism, and their work is central to the movement as a whole. They're not, however, the only important Cubists.
The term analytical cubism describes the early phase of cubism, generally considered to run from 1908–12, characterized by a fragmentary appearance of multiple viewpoints and overlapping planes
In an attempt to classify the revolutionary experiments made by Pablo Picasso, Georges Braque and Juan Gris when they were exponents of cubism, historians have tended to divide cubism into two stages. The early phase, generally considered to run from 1908–12 is called analytical cubism and the second is called synthetic cubism.
It is termed analytical cubism because of its structured dissection of the subject, viewpoint-by-viewpoint, resulting in a fragmentary image of multiple viewpoints and overlapping planes. Other distinguishing features of analytical cubism were a simplified palette of colours, so the viewer was not distracted from the structure of the form, and the density of the image at the centre of the canvas.
In an attempt to classify the revolutionary experiments made in cubism by Georges Braque, Pablo Picasso and Juan Gris, historians tend to divide cubism into two stages, analytical and synthetic.
Synthetic cubism began when the artists started adding textures and patterns to their paintings, experimenting with collage using newspaper print and patterned paper. Analytical cubism was about breaking down an object (like a bottle) viewpoint-by-viewpoint, into a fragmentary image; whereas synthetic cubism was about flattening out the image and sweeping away the last traces of allusion to three-dimensional space.
Picasso’s papier collés are a good example of synthetic cubism.