assessing vs evaluation

assessing

noun
  • Action of the verb to assess; assessment. 

evaluation

noun
  • Determination of the value of a variable or expression. 

  • An assessment, such as an annual personnel performance review used as the basis for a salary increase or bonus, or a summary of a particular situation. 

  • A completion of a mathematical operation; a valuation. 

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