Single layer systems are single or multi functional facilities. The layer is usually mounted as a permanent addition, but some can be collapsed or removed for accessing the original opening treatment system. An opening treatment system is considered single layered when other layers are well distanced. Layer systems are plainer or have a substantial body so work by their extent, and thickness.

Multi Layered systems have several shading devices each of which or as combination are operative. Different layers occur together and often need to operate in unison or some strategy. Individual layers can be spread, collapsed or removed, but operation of a particular layer becomes difficult as direct access to it is blockaded by other layers. Multi layered devices are effective for the order of their position or sequencing. Each layer barricades not only the desired element but also affects role of other elements.

Additive systems are used as an optional or occasional facility. These are like beach umbrellas or awnings. These are temporary so no permanent structure is installed. There are two essential climatic variations. In cold climates the shading device is bottom opened like an awning to let sunlight warm up the floor but cut-off the eye level glare. Whereas in warm climates the shading device opens like hopper to direct the light towards the ceiling for diffused illumination and cut-off the bright eye level glare.

Collapsible or folding system requires a volumetric space for parking or resting, which reduces the nett area of opening.

Pseudo or pretentious shading devices are in the form of furniture elements, furnishings, panelling, partitions and other architectural devices.

Machines that manipulate the effects of opening systems.

Internal shading devices are predominantly of soft materials such as fabrics, films, sheets or stiffer materials such as reeds, slats, etc. Thin and pliable materials allow the assembly to collapse, gather or roll up. Glass surface treatments now make up a large set of internal method of modifying the openings and include application of films, texturizing, metallizing, enamelling and colouring.