A method of determining the most likely composition of a sample by at least two technologies using a spectrometer including a Raman spectrometer and a Fourier Transform Infra Red (FTIR) spectrometer, the method comprising: a. obtaining data from the sample by a first technology being one of Raman spectroscopy or FTIR spectroscopy using the spectrometer, wherein the data comprises a first representation of a measured spectrum obtained by the first technology; b. determining a precision state of the first representation of the measured spectrum; c. providing a first set of library candidates and, for each library candidate, providing data representing each library candidate, wherein the data comprises a representation of a library spectrum obtained by the first technology; d. selecting a first subset of library candidates by determining a first representation of the similarity of the sample to each library candidate in the first set of library candidates using (i) the first representation of the measured spectrum; (ii) the precision state of the first representation of the measured spectrum; and (iii) the representation of the library spectrum for that library candidate; e. determining a first most likely composition of the sample based upon the selected first subset of library candidates; f. obtaining data from the sample by a second technology being the other of Raman spectroscopy and FTIR spectroscopy using the spectrometer, wherein the data comprises a second representation of a measured spectrum obtained by the second technology; g. determining a precision state of the second representation of the measured spectrum; h. providing a second set of library candidates and, for each library candidate, providing data representing each library candidate, wherein the data comprises a representation of a library spectrum obtained by the second technology; i. selecting a second subset of library candidates by determining a second representation of the similarity of the sample to each library candidate in the second set of library candidates using (i) the second representation of the measured spectrum; (ii) the precision state of the second representation of the measured spectrum; and (iii) the representation of the library spectrum for that library candidate, wherein the first most likely composition of the sample is added to the second subset of library candidates; j. determining a second most likely composition of the sample based upon the selected second subset of library candidates; k. determining a resulting most likely composition of the sample based upon the first and second most likely composition of the sample; and l. displaying the resulting most likely composition of the sample to a user. a. obtaining data from the sample by a first technology being one of Raman spectroscopy or FTIR spectroscopy using the spectrometer, wherein the data comprises a first representation of a measured spectrum obtained by the first technology; b. determining a precision state of the first representation of the measured spectrum; c. providing a first set of library candidates and, for each library candidate, providing data representing each library candidate, wherein the data comprises a representation of a library spectrum obtained by the first technology; d. selecting a first subset of library candidates by determining a first representation of the similarity of the sample to each library candidate in the first set of library candidates using (i) the first representation of the measured spectrum; (ii) the precision state of the first representation of the measured spectrum; and (iii) the representation of the library spectrum for that library candidate; e. determining a first most likely composition of the sample based upon the selected first subset of library candidates; f. obtaining data from the sample by a second technology being the other of Raman spectroscopy and FTIR spectroscopy using the spectrometer, wherein the data comprises a second representation of a measured spectrum obtained by the second technology; g. determining a precision state of the second representation of the measured spectrum; h. providing a second set of library candidates and, for each library candidate, providing data representing each library candidate, wherein the data comprises a representation of a library spectrum obtained by the second technology; i. selecting a second subset of library candidates by determining a second representation of the similarity of the sample to each library candidate in the second set of library candidates using (i) the second representation of the measured spectrum; (ii) the precision state of the second representation of the measured spectrum; and (iii) the representation of the library spectrum for that library candidate, wherein the first most likely composition of the sample is added to the second subset of library candidates; j. determining a second most likely composition of the sample based upon the selected second subset of library candidates; k. determining a resulting most likely composition of the sample based upon the first and second most likely composition of the sample; and l. displaying the resulting most likely composition of the sample to a user.