Develop a preliminary work breakdown structure (WBS) for a small one-story commercial building to be constructed on the site of an existing small-frame structure. It is 30 by 60 ft in plan (see illustration). The exterior and interior walls are of concrete block. The roof is constructed of bar joists covered with a steel roof deck, rigid insulation, and built-up roofing. The ceiling is pended acoustical tile. The floor is a concrete slab on grade with an asphalt tile finish. Interior finish on all walls is paint. a) Show the first level of this structure for the total project (WBS is developed from top to the bottom). b) Select one work package (or building system) of the first level and develop the second- level structure for this work package. Heat and mechanical Lavatory Storage

It involves the demolition or cureacking of buildings and other structures clearing of building sites and sale of materials from demolished strictures.

Mechanical System:

It is a system with moving parts. anything with moving parts can be considered as mechanical system.

Building Walls:

Wall is a structure that defines an area, carries load, provide shelter , sound proofing or is decorative.

Electrical system:

Electrical system are a group of electrical components connected to carry out some operation . often-the system are combined with other systems.

B) Draw the second level WBS system as shown below.

See image 2

Plumbing:

It is a system that provides fluid for a wide range of applications . plumbing uses pipes, valves, tanks and other apparatus to carry fluids.

Air heating System:

This can be made cost effective by combining with ventilation system.

Water Heating:

It is a heat transfer process that uses an energy source to heat water above its initial temperature.

Air conditioning:

Air conditioning is the process of removing heat and moisture from the interior of and occupied space to improve the comfort of residents.

Ventilation system:

It is intentional introduction of outside air into space and is mainly used to control indoor air quality by by diluting and displacing indoor pollutants.