Difference between limit state method and working stress method

LIMILT STATE METHOD	WORKING STRESS METHOD
1.The stresses are obtained from design loads and compared with design strength.	1.The Stresses in an element is obtained from the working loads and compared with permissible stresses.
2.In this method, it follows linear strain relationship but not linear  stress relationship (one of the major difference between the two  methods of design).	2.The method follows linear stress-strain behaviour of both the materials.
3.The ultimate stresses of materials itself are used as allowable stresses.	3.Modular ratio can be used to determine allowable stresses.
4.The material capabilities are not under estimated as much as they  are in working stress method. Partial safety factors are used in limit  state method.	4.Material capabilities are under estimated to large extent. Factor of safety are used in working stress method.
5.The main drawback of this method is that it results in an economical section.	5.The member is considered as working stress.
	6.Ultimate load carrying capacity cannot be predicted accurately.
	7.The main drawback of this method is that it results in an uneconomical section.