Difference between systematic and thematic

[Guest]

Test No. incompl/advan-23 "Product Improvement", question 6

Inspiration has its place in any form of product development but at the same time you also need to adopt some kind of ......... approach.

(a) systematic
(b) thematic
(c) automatic
(d) emblematic

Test No. incompl/advan-23 "Product Improvement", answer 6

Inspiration has its place in any form of product development but at the same time you also need to adopt some kind of systematic approach.

Correct answer: (a) systematic

Your answer was: incorrect
Inspiration has its place in any form of product development but at the same time you also need to adopt some kind of thematic approach.
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Sorry, cannot understand why "thematic" was wrong.

[Alan]

I've chosen systematic in this sentence to show contrast with inspiration - in other words being practical as well as imaginative and thematic doesn't work here.
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