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Consider the following rules of the network diagram and state which of them are correct: (i) Network always has a single initial and final event. (ii) An event can occur twice. (iii) No activity can start until its tail end event has occurred. (iv) It is usual practice to show time flow from right to left.

Consider the following rules of the network diagram and state which of them are correct: (i) Network always has a single initial and final event. (ii) An event can occur twice. (iii) No activity can start until its tail end event has occurred. (iv) It is usual practice to show time flow from right to left. Correct Answer (i) and (iii)

Explanation:

Rules of a network:

(i) There can be only one initial and one final event.

(ii) An event cannot occur unless all preceding activities are completed.

(iii) An event cannot occur twice.

(iv) Number of arrows should be equal to the number of activities.

(v) Time should always flow from left to right.

(vi) Length f arrow does not show any magnitude. Straight arrows should be taken as far as possible.

(vii) Arrows should normally not cross each other. If it is necessary to cross, one should be bridged over the other.

(viii) No activity can start until its tail event has occurred.

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