---
title: "Focusing for Interpretation of Pronouns — paper by Sidner (1981)"
description: "She replaces antecedence with specification (a phrase picks out a cognitive or database element)… 36 references, cited by 27 papers here."
authors: ["Candace L. Sidner"]
year: 1981
venue: "Computational Linguistics"
source: "https://aclanthology.org/J81-4001/"
licence: "CC BY-NC-SA 3.0 (ACL Anthology, before 2016)"
licence_url: "https://creativecommons.org/licenses/by-nc-sa/3.0/"
summary_licence: "Elamur Cosmic License"
canonical: "https://research.elamur.ai/free/en/papers/sidner-1981-focusing-interpretation-pronouns/"
---
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# Focusing for Interpretation of Pronouns

**Authors:** [Candace L. Sidner](https://md.research.elamur.ai/free/en/authors/candace-l-sidner/) · **Year:** 1981 · **Venue:** [Computational Linguistics](https://md.research.elamur.ai/free/en/venues/cl/) ([Computational Linguistics 1981](https://md.research.elamur.ai/free/en/venues/cl/1981/)) · **Licence:** [CC BY-NC-SA 3.0 (ACL Anthology, before 2016)](https://creativecommons.org/licenses/by-nc-sa/3.0/)

**Links:** [Publisher's page](https://aclanthology.org/J81-4001/) · [PDF](https://aclanthology.org/J81-4001.pdf) · [OpenAlex](https://openalex.org/W2096979259)

**Citations:** 100 citations (OpenAlex, 2026-10-14) · [27](https://md.research.elamur.ai/free/en/papers/sidner-1981-focusing-interpretation-pronouns/cited-by/) in our library, of the 149,439 papers whose bibliographies we read

## Summary
Sidner addresses how a listener or a program works out what a pronoun stands for. She argues that the classic notion of an "antecedent" is flawed. Words do not point to other words, and a pronoun may denote something no earlier phrase literally names. Her example is "they" denoting Harley 1200 bikes as a class after only one specific bike was mentioned. She replaces antecedence with *specification* (a phrase picks out a cognitive or database element) and *co-specification* (two phrases pick out the same element). On this basis she builds a focusing theory. The discourse tracks a current actor focus and discourse focus, plus potential foci and a stack of earlier foci. Ordered rules then propose candidate interpretations, and a method called constraint checking tests them using syntactic, semantic and inferential knowledge, which keeps inference bounded. The result is a rule-governed account of both correct readings and comprehension failures. The work is purely theoretical and computational, with no corpus evaluation, and it laid groundwork for later focus- and centering-based anaphora resolution.

## Key points
- Published in Computational Linguistics (1981) by Candace L. Sidner of Bolt Beranek and Newman Inc. The work was partly done at the MIT AI Laboratory with ARPA funding.
- It introduces *specification* and *co-specification* as alternatives to co-reference. This lets relations between mental representations be modelled computationally.
- The focus structures it uses are:
  - actor focus;
  - discourse focus;
  - potential actor foci;
  - potential discourse foci;
  - a focus stack searched last-in, first-out.
- Separate ordered rule sets cover agent-position and non-agent-position pronouns. They include:
  - a recency rule;
  - a theme rule;
  - a potential actor ambiguity condition;
  - plural rules;
  - a focus-related item rule;
  - a closure rule that flags forward co-specifiers or "missing co-specifier" cases.
- The theory is claimed to be both predictive, by separating acceptable from odd pronoun uses, and explanatory. The author also acknowledges limits, such as the lack of a syntactic theory of forward co-specification.

*Our summary of the paper, in our own words — not its text. The work belongs to its authors; read it at the links above.*

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## Cite

Cite as: Candace L. Sidner. 1981. Focusing for Interpretation of Pronouns. Computational Linguistics.

The paper itself, not this page. BibTeX from the library's record of the work.

```bibtex
@article{sidner1981focusing,
  title = {{Focusing for Interpretation of Pronouns}},
  author = {Candace L. Sidner},
  journal = {Computational Linguistics},
  year = {1981},
  doi = {10.5555/972911.972912},
  url = {https://doi.org/10.5555/972911.972912}
}
```

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## References

36 references, 1 of them with a card of ours. ↗ leads to the work, «find» searches for one we have no id for yet.

1. Chafe, W. 1975 "Structures and Human Knowledge." In J.B. Carroll and R.O. Freedle (eds.), Language Comprehension and the Acquisition of Knowledge. V.H. Winston and Sons, pp. 41-69. [find](https://scholar.google.com/scholar?q=Chafe%2C+W%2E+1975+%22Structures+and+Human+Knowledge%2E%22+In+J%2EB%2E+Carroll+and+R%2EO%2E+Freedle+%28eds%2E%29%2C+Language+Comprehension+and+the+Acquisition+of+Knowledge%2E+V%2EH%2E+Winston+and+Sons%2C+pp%2E+41%2D69%2E)
2. Charniak, E. 1972 "Toward a Model of Children's Story Comprehension." MIT AI Lab TR-266. [find](https://scholar.google.com/scholar?q=Charniak%2C+E%2E+1972+%22Toward+a+Model+of+Children%27s+Story+Comprehension%2E%22+MIT+AI+Lab+TR%2D266%2E)
3. Chomsky, N. 1976 "Conditions on Rules of Grammar." Linguistic Analysis 2(4), pp. 303-351. [find](https://scholar.google.com/scholar?q=Chomsky%2C+N%2E+1976+%22Conditions+on+Rules+of+Grammar%2E%22+Linguistic+Analysis+2%284%29%2C+pp%2E+303%2D351%2E)
4. Deutsch, B. 1975 "Establishing Context in Task-Oriented Dialogues." Proceedings of the 13th Annual Meeting of ACL. AJCL Microfiche 35. [find](https://scholar.google.com/scholar?q=Deutsch%2C+B%2E+1975+%22Establishing+Context+in+Task%2DOriented+Dialogues%2E%22+Proceedings+of+the+13th+Annual+Meeting+of+ACL%2E+AJCL+Microfiche+35%2E)
5. Deutsch, B. 1974 "Typescripts of Task Oriented Dialogs." Unpublished manuscript, SRI International, Menlo Park, Calif. [find](https://scholar.google.com/scholar?q=Deutsch%2C+B%2E+1974+%22Typescripts+of+Task+Oriented+Dialogs%2E%22+Unpublished+manuscript%2C+SRI+International%2C+Menlo+Park%2C+Calif%2E)
6. Doyle, Jon 1978 "Truth Maintenance Systems for Problem Solving." MIT AI Lab AI-TR-419, January. [find](https://scholar.google.com/scholar?q=Doyle%2C+Jon+1978+%22Truth+Maintenance+Systems+for+Problem+Solving%2E%22+MIT+AI+Lab+AI%2DTR%2D419%2C+January%2E)
7. Fahlman, Scott E. 1977 "A System for Representing and Using Real-World Knowledge." MIT AI Lab A1-TR-450, December. [find](https://scholar.google.com/scholar?q=Fahlman%2C+Scott+E%2E+1977+%22A+System+for+Representing+and+Using+Real%2DWorld+Knowledge%2E%22+MIT+AI+Lab+A1%2DTR%2D450%2C+December%2E)
8. Grosz, Barbara 1977 "The Representation and Use of Focus in Dialogue Understanding." SRI Technical Note 151, Menlo Park, California. [find](https://scholar.google.com/scholar?q=Grosz%2C+Barbara+1977+%22The+Representation+and+Use+of+Focus+in+Dialogue+Understanding%2E%22+SRI+Technical+Note+151%2C+Menlo+Park%2C+California%2E)
9. Grosz, Barbara 1978 "Focusing in Dialog." Tinlap-2: Theoretical Issues in Natural Language Processing. ACM and ACL, New York, 96-103. [find](https://scholar.google.com/scholar?q=Grosz%2C+Barbara+1978+%22Focusing+in+Dialog%2E%22+Tinlap%2D2%3A+Theoretical+Issues+in+Natural+Language+Processing%2E+ACM+and+ACL%2C+New+York%2C+96%2D103%2E)
10. Grosz, Barbara 1981 "Focusing and Description in Natural Language Dialogues." in Joshi, Sag and Webber (eds.) Proceedings of the Workshop on Computational Aspects of Linguistic Structure and Discourse Setting. Cambridge University Press, Cambridge, pp. 84-105. [find](https://scholar.google.com/scholar?q=Grosz%2C+Barbara+1981+%22Focusing+and+Description+in+Natural+Language+Dialogues%2E%22+in+Joshi%2C+Sag+and+Webber+%28eds%2E%29+Proceedings+of+the+Workshop+on+Computational+Aspects+of+Linguistic+Structure+and+Discourse)
11. Halliday, M.A.K. 1967 "Notes on Transitivity and Theme in English." Journal of Linguistics 3. pp. 117-274. [find](https://scholar.google.com/scholar?q=Halliday%2C+M%2EA%2EK%2E+1967+%22Notes+on+Transitivity+and+Theme+in+English%2E%22+Journal+of+Linguistics+3%2E+pp%2E+117%2D274%2E)
12. Hobbs, Jerry R. 1976 "Pronoun Resolution." Research Report \#76-1, City College, City University of New York. [find](https://scholar.google.com/scholar?q=Hobbs%2C+Jerry+R%2E+1976+%22Pronoun+Resolution%2E%22+Research+Report+%5C%2376%2D1%2C+City+College%2C+City+University+of+New+York%2E)
13. Hobbs, Jerry R. 1977 "38 Examples of Elusive Antecedents from Published Texts." Research Report \#76-2, City College, City University of New York. [find](https://scholar.google.com/scholar?q=Hobbs%2C+Jerry+R%2E+1977+%2238+Examples+of+Elusive+Antecedents+from+Published+Texts%2E%22+Research+Report+%5C%2376%2D2%2C+City+College%2C+City+University+of+New+York%2E)
14. Hobbs, Jerry R. 1979 "Coherence and Co-reference." Cognitive Science. 3(1):67-90. [find](https://scholar.google.com/scholar?q=Hobbs%2C+Jerry+R%2E+1979+%22Coherence+and+Co%2Dreference%2E%22+Cognitive+Science%2E+3%281%29%3A67%2D90%2E)
15. Katz, Jerrold J. & Fodor, Jerry A. 1963 "The Structure of a Semantic Theory." Language. 39(2): 170-210. [find](https://scholar.google.com/scholar?q=Katz%2C+Jerrold+J%2E+%26+Fodor%2C+Jerry+A%2E+1963+%22The+Structure+of+a+Semantic+Theory%2E%22+Language%2E+39%282%29%3A+170%2D210%2E)
16. Lasnick, Howard 1976 "Remarks on Co-reference." Linguistic Analysis. 2(1):1-22. [find](https://scholar.google.com/scholar?q=Lasnick%2C+Howard+1976+%22Remarks+on+Co%2Dreference%2E%22+Linguistic+Analysis%2E+2%281%29%3A1%2D22%2E)
17. Lockman, Abe D. 1978 "Contextual Reference Resolution in Natural Language Processing." Dept. of Computer Science TR-70, Rutgers University, New Brunswick, N.J. [find](https://scholar.google.com/scholar?q=Lockman%2C+Abe+D%2E+1978+%22Contextual+Reference+Resolution+in+Natural+Language+Processing%2E%22+Dept%2E+of+Computer+Science+TR%2D70%2C+Rutgers+University%2C+New+Brunswick%2C+N%2EJ%2E)
18. Marcus Mitchell 1980 "A Theory of Syntactic Recognition for Natural Language", MIT Press, Cambridge, Mass. [find](https://scholar.google.com/scholar?q=Marcus+Mitchell+1980+%22A+Theory+of+Syntactic+Recognition+for+Natural+Language%22%2C+MIT+Press%2C+Cambridge%2C+Mass%2E)
19. Martin, William 1979 "Roles, Co-Descriptors and the Formal Representation of Quantified English Expressions." Laboratory for Computer Science, TM-139, MIT, Cambridge, Mass. [find](https://scholar.google.com/scholar?q=Martin%2C+William+1979+%22Roles%2C+Co%2DDescriptors+and+the+Formal+Representation+of+Quantified+English+Expressions%2E%22+Laboratory+for+Computer+Science%2C+TM%2D139%2C+MIT%2C+Cambridge%2C+Mass%2E)
20. Morgan, Jerry L. 1978 "Toward a Rational Model of Discourse Comprehension." Tinlap-2: Theoretical Issues in Natural Language Processing. ACM and ACL, New York, 109-114. [find](https://scholar.google.com/scholar?q=Morgan%2C+Jerry+L%2E+1978+%22Toward+a+Rational+Model+of+Discourse+Comprehension%2E%22+Tinlap%2D2%3A+Theoretical+Issues+in+Natural+Language+Processing%2E+ACM+and+ACL%2C+New+York%2C+109%2D114%2E)
21. American Journal of Computational Linguistics, Volume 7, Number 4, McAllester, David A. 1978 "A Three Valued Truth Maintenance System." MIT AI Lab Memo 473, Cambridge, Mass., May. [find](https://scholar.google.com/scholar?q=American+Journal+of+Computational+Linguistics%2C+Volume+7%2C+Number+4%2C+McAllester%2C+David+A%2E+1978+%22A+Three+Valued+Truth+Maintenance+System%2E%22+MIT+AI+Lab+Memo+473%2C+Cambridge%2C+Mass%2E%2C+May%2E)
22. Partee, Barbara H. 1972 "Opacity, Co-reference and Pronouns." in Davidson and Harman (eds.) Semantics of Natural Language. Reidel, Boston, pp. 415-441. [find](https://scholar.google.com/scholar?q=Partee%2C+Barbara+H%2E+1972+%22Opacity%2C+Co%2Dreference+and+Pronouns%2E%22+in+Davidson+and+Harman+%28eds%2E%29+Semantics+of+Natural+Language%2E+Reidel%2C+Boston%2C+pp%2E+415%2D441%2E)
23. Partee, Barbara H. 1978 "Bound Variables and Other Anaphors." Tinlap-2: Theoretical Issues in Natural Language Processing, 79-85, ACM and ACL, New York. 1969 "'Anaphoric Islands." Proceedings of the Fifth Meeting of the Chicago Linguistic Society. Chicago, 5:205-239. [find](https://scholar.google.com/scholar?q=Partee%2C+Barbara+H%2E+1978+%22Bound+Variables+and+Other+Anaphors%2E%22+Tinlap%2D2%3A+Theoretical+Issues+in+Natural+Language+Processing%2C+79%2D85%2C+ACM+and+ACL%2C+New+York%2E+1969+%22%27Anaphoric+Islands%2E%22+Proceedings+of+the+F)
24. Reichman, R. 1978 "Conversational Coherency." Cognitive Science, 2(4):283-327. [find](https://scholar.google.com/scholar?q=Reichman%2C+R%2E+1978+%22Conversational+Coherency%2E%22+Cognitive+Science%2C+2%284%29%3A283%2D327%2E)
25. Reinhart, Tanya 1976 "The Syntactic Domain of Anaphora." unpublished Ph.D. dissertation, Department of Foreign Literature and Linguistics, MIT, Cambridge, Mass. [find](https://scholar.google.com/scholar?q=Reinhart%2C+Tanya+1976+%22The+Syntactic+Domain+of+Anaphora%2E%22+unpublished+Ph%2ED%2E+dissertation%2C+Department+of+Foreign+Literature+and+Linguistics%2C+MIT%2C+Cambridge%2C+Mass%2E)
26. Reiger, Charles J. 1974 "Conceptual Memory: A Theory and Computer Program for Processing the Meaning Content of Natural Language Utterances." Stanford AI Lab Memo AIM-233. [find](https://scholar.google.com/scholar?q=Reiger%2C+Charles+J%2E+1974+%22Conceptual+Memory%3A+A+Theory+and+Computer+Program+for+Processing+the+Meaning+Content+of+Natural+Language+Utterances%2E%22+Stanford+AI+Lab+Memo+AIM%2D233%2E)
27. Robinson, Ann 1981 "[Determining Verb Phrase Referents in Dialogs](https://md.research.elamur.ai/free/en/papers/robinson-1981-determining-verb-phrase-referents-dialogs/)," Am. J. Comp. Ling. 7(1):1-16.
28. Sidner, C.L. 1979 "Towards a Computational Theory of Definite Anaphora Comprehension in English Discourse." MIT AI Lab Technical Report \#537. [find](https://scholar.google.com/scholar?q=Sidner%2C+C%2EL%2E+1979+%22Towards+a+Computational+Theory+of+Definite+Anaphora+Comprehension+in+English+Discourse%2E%22+MIT+AI+Lab+Technical+Report+%5C%23537%2E)
29. Solan, Lawrence 1978 "Anaphora in Child Language." Ph.D. dissertation, Dept. of Linguistics, University of Massachusetts, Amherst (available through the Graduate Linguistic Student Association, University of Massachusetts). [find](https://scholar.google.com/scholar?q=Solan%2C+Lawrence+1978+%22Anaphora+in+Child+Language%2E%22+Ph%2ED%2E+dissertation%2C+Dept%2E+of+Linguistics%2C+University+of+Massachusetts%2C+Amherst+%28available+through+the+Graduate+Linguistic+Student+Association%2C+Univer)
30. Van Lehn, Kurt A. 1978 "Determining the Scope of English Quantifiers." MIT AI Lab AI-TR-483, Cambridge, Mass. [find](https://scholar.google.com/scholar?q=Van+Lehn%2C+Kurt+A%2E+1978+%22Determining+the+Scope+of+English+Quantifiers%2E%22+MIT+AI+Lab+AI%2DTR%2D483%2C+Cambridge%2C+Mass%2E)
31. Walker, Donald E. (ed.) 1976 "Speech Understanding Research." Final Technical Repoi't, Project 4762. AI Center, SRI International, Menlo Park, Calif. [find](https://scholar.google.com/scholar?q=Walker%2C+Donald+E%2E+%28ed%2E%29+1976+%22Speech+Understanding+Research%2E%22+Final+Technical+Repoi%27t%2C+Project+4762%2E+AI+Center%2C+SRI+International%2C+Menlo+Park%2C+Calif%2E)
32. Webber, Bonnie Lynn 1978 "A Formal Approach to Discourse Anaphora." Technical Report 3761, Bolt Beranek and Newman Inc., Cambridge, Mass. [find](https://scholar.google.com/scholar?q=Webber%2C+Bonnie+Lynn+1978+%22A+Formal+Approach+to+Discourse+Anaphora%2E%22+Technical+Report+3761%2C+Bolt+Beranek+and+Newman+Inc%2E%2C+Cambridge%2C+Mass%2E)
33. Winograd, Terry 1972 Understanding Natural Language. Academic Press, New York. [find](https://scholar.google.com/scholar?q=Winograd%2C+Terry+1972+Understanding+Natural+Language%2E+Academic+Press%2C+New+York%2E)
34. Woods, William 1973 "An Experimental Parsing System for Transition Network Grammars." in Rustin (ed.) Natural Language Processing. Algorithmics Press, New York, pp. 111-154. [find](https://scholar.google.com/scholar?q=Woods%2C+William+1973+%22An+Experimental+Parsing+System+for+Transition+Network+Grammars%2E%22+in+Rustin+%28ed%2E%29+Natural+Language+Processing%2E+Algorithmics+Press%2C+New+York%2C+pp%2E+111%2D154%2E)
35. Woods, William et al. 1976 "Speech Understanding Systems: Final Technical Progress Report - 30 October 1974 through 29 October 1976." Technical, Report 3438, Bolt Beranek and Newman Inc., Cambridge, Mass. [find](https://scholar.google.com/scholar?q=Woods%2C+William+et+al%2E+1976+%22Speech+Understanding+Systems%3A+Final+Technical+Progress+Report+%2D+30+October+1974+through+29+October+1976%2E%22+Technical%2C+Report+3438%2C+Bolt+Beranek+and+Newman+Inc%2E%2C+Cambridge%2C+M)
36. Candy Sidner is a Scientist in the Department o f A r t i f i c i a l Intelligence at Bolt B e r a n e k and N e w m a n Inc. S h e received the Ph.D. in computer science f r o m M . I . T . in 1979. [find](https://scholar.google.com/scholar?q=Candy+Sidner+is+a+Scientist+in+the+Department+o+f+A+r+t+i+f+i+c+i+a+l+Intelligence+at+Bolt+B+e+r+a+n+e+k+and+N+e+w+m+a+n+Inc%2E+S+h+e+received+the+Ph%2ED%2E+in+computer+science+f+r+o+m+M+%2E+I+%2E+T+%2E+in+1979%2E)

*Updated 30 October 2026*