There are three kinds of time estimates made by PERT planners. These are optimistic time estimate, pessimistic time estimate and most likely time estimate. The shortest possible time in which an activity can be achieved under ideal circumstances is known as optimistic time estimate.

The full form of BIS is Bureau of Indian Standards. The conventional symbols used in building drawings are standardised by BIS are followed nationally as well as internationally.

The symbol A represents generator and symbol B represents ammeter. An ammeter is an instrument which is used for measuring current.

There are three phases of project management. These are project planning, project scheduling and project controlling. Project management refers to a highly specialised job to achieve objectives of a project.

The two types of water closets mainly used are Indian type water closet and Western-style water closet. The symbol A given above represents Indian type water closet. The symbol B represents Western-style water closet.

There are various network techniques that are called by various names like PERT, CPM, TOPS and LESS. Network technique is one of major advancements in management science. The full form of PERT is Program Evaluation and Review Technique.

The symbol given above represents fire hydrant. A fire hydrant is used by firefighters to supply water for fighting fires.

In a network, a critical path is time-wise longest path. The critical path in Critical Path Method plays an essential role in scheduling and planning.

A CPM network is activity-oriented while a PERT network is event-oriented. Event is completion of an activity or commencement of an activity. An event may be head event, tail event or dual role event.

A foundation plan depicts details of different types of foundations provided for building. The various types of foundations which a building may contain are spread footing for walls, strap footing for two columns, raft foundation for a group of columns etc.