A method for monitoring application of a surface treatment to an article (30; 56) in a manufacturing process, the method comprising: applying the surface treatment to at least a portion of the article (30; 56); wherein the method is characterized by comprising: receiving a thermal profile of the at least a portion of the article (30; 56); determining a first temperature indication of a first region of the article (30; 56) from the thermal profile ; determining a second temperature indication of a second region of the article (30; 56) from the thermal profile ; accessing a standard model for the article (30; 56) comprising: a first model region that corresponds to the first region , the first model region having an associated first model temperature range, and a second model region that corresponds to the second region , the second model region having an associated second model temperature range; comparing the first temperature indication to the first model temperature range to determine if the first temperature indication is outside of the first model temperature range; and comparing the second temperature indication to the second model temperature range to determine if the second temperature indication is outside of the second model temperature range. applying the surface treatment to at least a portion of the article (30; 56); wherein the method is characterized by comprising: receiving a thermal profile of the at least a portion of the article (30; 56); determining a first temperature indication of a first region of the article (30; 56) from the thermal profile ; determining a second temperature indication of a second region of the article (30; 56) from the thermal profile ; accessing a standard model for the article (30; 56) comprising: a first model region that corresponds to the first region , the first model region having an associated first model temperature range, and a second model region that corresponds to the second region , the second model region having an associated second model temperature range; comparing the first temperature indication to the first model temperature range to determine if the first temperature indication is outside of the first model temperature range; and comparing the second temperature indication to the second model temperature range to determine if the second temperature indication is outside of the second model temperature range. receiving a thermal profile of the at least a portion of the article (30; 56); determining a first temperature indication of a first region of the article (30; 56) from the thermal profile ; determining a second temperature indication of a second region of the article (30; 56) from the thermal profile ; accessing a standard model for the article (30; 56) comprising: a first model region that corresponds to the first region , the first model region having an associated first model temperature range, and a second model region that corresponds to the second region , the second model region having an associated second model temperature range; comparing the first temperature indication to the first model temperature range to determine if the first temperature indication is outside of the first model temperature range; and comparing the second temperature indication to the second model temperature range to determine if the second temperature indication is outside of the second model temperature range. <EOS>