A method for controlling a process in a process plant having one or more field devices (130, 140 and 150) using control system having a controller, the process including a first steady state wherein the controller controls the process within first operating region, a second steady state wherein the controller controls the process within a second operating region, and a transition between the first steady state and second steady state, wherein the method, by using the control system, comprises: (i) receiving process data from at least one field device in relation to a first process variable and a second process variable associated with the process; (ii) determining a first value of at least one key performance indicator from the process data of at least one of the first process variable and the second process variable between the first steady state and the second steady state, wherein the at least on key performance indicator is indicative of a profile of the transition; (iii) comparing the first value with a first threshold value corresponding to the at least one key performance indicator wherein the first threshold value is calculated from one or more transitions from historic process data of the first process variable; (iv) comparing the process data of the first process variable and the process data of the second process variable between the first steady state and the second steady state to a model of transition, wherein an influence of the first process variable and the second process variable in the transition is determined using the model of transition; (v) determining a process variable to be corrected by the comparing of the process data of the first process variable and the process data of the second process variable with the model of transition by identifying whether the first process variable or the second process variable or combination thereof contributed to the transition being abnormal; and (vi) determining a correction factor for the process variable to be corrected, based on comparison of the first value of the at least one key performing indicator with the first threshold value for controlling the process in the process plant. (i) receiving process data from at least one field device in relation to a first process variable and a second process variable associated with the process; (ii) determining a first value of at least one key performance indicator from the process data of at least one of the first process variable and the second process variable between the first steady state and the second steady state, wherein the at least on key performance indicator is indicative of a profile of the transition; (iii) comparing the first value with a first threshold value corresponding to the at least one key performance indicator wherein the first threshold value is calculated from one or more transitions from historic process data of the first process variable; (iv) comparing the process data of the first process variable and the process data of the second process variable between the first steady state and the second steady state to a model of transition, wherein an influence of the first process variable and the second process variable in the transition is determined using the model of transition; (v) determining a process variable to be corrected by the comparing of the process data of the first process variable and the process data of the second process variable with the model of transition by identifying whether the first process variable or the second process variable or combination thereof contributed to the transition being abnormal; and (vi) determining a correction factor for the process variable to be corrected, based on comparison of the first value of the at least one key performing indicator with the first threshold value for controlling the process in the process plant.