instrumentation vs modus operandi

instrumentation

noun
  • The act or manner of playing upon musical instruments; performance. 

  • The dynamic analysis of a program's performance and behaviour, usually by injecting profiling code into it. 

  • On a vehicle, dashboard gauges monitoring engine functions and performance, along with other essential functions. 

  • The act of using or adapting as an instrument; a series or combination of instruments. 

  • The arrangement of a musical composition for performance by a number of different instruments; instrumental composition; composition for an orchestra or military band. 

modus operandi

noun
  • A person or thing's normal mode of operation. 

  • A known criminal's established habits and mode of work when committing specific offences, especially fraud, matched with characteristics of an unsolved crime to narrow down (limit to a specific list) or profile suspects. 

How often have the words instrumentation and modus operandi occurred in a corpus of books? (source: Google Ngram Viewer )