Quantitative Layout Analysis - Correlation Chart

 In this technique we draw a gird with rows presenting alternative solutions. Plant item can be a ground floor (G >F) First floor (FF) or second floor (SF) or other floors like TF,FF, and FTF and so on.

After the gird is draw the next step involves identifying the objective and constraints of the same to find out the better layout. For example the constraints may be

1.  Product X cannot be done on ground floor (GF)
2.  Operations Y cannot be performed on floor (FF) similarly the objectives may be.
3.  Objectives W should be done on second floor (SF) like this first list out the constraints and objectives and gives certain codes them.

These constraints objectives are then filled in the squares of the grid. The way in which we have to apply these codes is when a constraint stops an item going in to a square, the number or that constraint is marked. After that the objectives or preferences are applied and the number of that preference or objective is filled in the corresponding square. Suppose the given objective is product W is restricted to second floor. (SF) it cannot be done on other floors. Hence the identification number of this objective, i.e. 3 is written in all squares except SF. Similarly other objectives are marked on the gird. A line PQ gives a feasible solution of the layout problem. Thus line is traced along the gird rows from the first plant item to the last item by joining open squares (where no number is entered). The possible solution is:

W_FF -X_SF- Z_GF- Y_SF