A method for detecting an inefficiency in a processing system (100, 202), said processing system (100, 202) being divided in a number of processing lines (204a, 204b, 204c), referred to as a first sub-level, said processing lines being in turn divided in a plurality of machine units (206a, 206b, 206c, 206d, 206e, 206f, 206g), referred to as a second sub-level, said method comprising determining a processing system (100, 202) performance indicator for said processing system (100, 202) by - Receiving by a control device of the processing system a request for a performance indicator for the processing system, - determining based on the information comprised in the request a performance indicator level by determining if said performance indicator is associated with said processing system, - determining based on the information comprised in the request a time period related to said performance indicator level, - receiving a time period value related to said time period, - determining based on the information comprised in the request a measurement device output related to said performance indicator, - receiving at least one measurement device output value related to said measurement device output, and - determining said performance indicator based on said measurement device output value and said time period value, if said processing system performance indicator differs from a processing system reference value, determining a processing line performance indicator for at least one of said processing lines (204a, 204b, 204c) in the processing system by - receiving by a control device of the processing system a request for a performance indicator for the at least one processing line, - determining a performance indicator level by determining if said performance indicator is associated with one of said processing lines in said first sub-level, - determining a time period related to said performance indicator level, - receiving a time period value related to said time period, - determining a measurement device output related to said performance indicator, - receiving at least one measurement device output value related to said measurement device output, and - determining said performance indicator based on said measurement device output value and said time period value, if said processing line performance indicator differs from a processing line reference value, determining a machine unit performance indicator for at least one of said machine units in said processing line, if said machine unit performance indicator differs from a machine unit reference value, identifying a machine unit related to said machine unit performance indicator. - Receiving by a control device of the processing system a request for a performance indicator for the processing system, - determining based on the information comprised in the request a performance indicator level by determining if said performance indicator is associated with said processing system, - determining based on the information comprised in the request a time period related to said performance indicator level, - receiving a time period value related to said time period, - determining based on the information comprised in the request a measurement device output related to said performance indicator, - receiving at least one measurement device output value related to said measurement device output, and - determining said performance indicator based on said measurement device output value and said time period value, if said processing system performance indicator differs from a processing system reference value, determining a processing line performance indicator for at least one of said processing lines (204a, 204b, 204c) in the processing system by - receiving by a control device of the processing system a request for a performance indicator for the at least one processing line, - determining a performance indicator level by determining if said performance indicator is associated with one of said processing lines in said first sub-level, - determining a time period related to said performance indicator level, - receiving a time period value related to said time period, - determining a measurement device output related to said performance indicator, - receiving at least one measurement device output value related to said measurement device output, and - determining said performance indicator based on said measurement device output value and said time period value,