Good Controllability and Observability Do Not Guarantee Good Testability

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


In this paper we show that good controllability and observability do not guarantee good testability. In fact, one can easily find examples of faults that are difficult or impossible to detect, although both the controllability and observability figures are good.

Original languageEnglish (US)
Pages (from-to)1198-1200
Number of pages3
JournalIEEE Transactions on Computers
Issue number12
StatePublished - Dec 1983
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Software
  • Theoretical Computer Science
  • Hardware and Architecture
  • Computational Theory and Mathematics


  • Controllability
  • deterministic testing
  • observability
  • random testing
  • testability


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