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David Parnas , taking a cue from the relationship between other engineering and science disciplines , has claimed that the principal focus of computer science is studying the properties of computation in general , while the principal focus of software engineering is the design of specific computations to achieve practical goals , making the two separate but complementary disciplines .
 person: David Parnas
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: David Parnas 
Answer:
 person: David Parnas