Gilewski, M. J., Zelinski, E. M., & Schaie, K. W. (1990). The Memory Functioning Questionnaire for assessment of memory complaints in adulthood and old age​. Psychology and Aging, 5, 482-490.

Nesselroade, J. R., & Schaie, K. W. (1990). Commentary on the Mulaik and Mumford exchange​. Human Development, 34, 180-183.

Schaie, K. W. (1990). Intellectual development in adulthood.​  In J. E. Birren & K. W. Schaie (Eds.), Handbook of the psychology of aging (3rd ed., pp. 291-309). New York: Academic Press.

Schaie, K. W. (1990). Late life potential and cohort differences in mental abilities.​ In M. Perlmutter (Ed.), Late life potentials (pp. 43-61). Washington, DC: Gerontological Society of America.

Schaie, K. W. (1990). The optimization of cognitive functioning in old age: Predictions based on cohort-sequential and longitudinal data.​ In P. B. Baltes & M. M. Baltes (Eds.), Successful aging: Perspectives from the behavioral sciences (pp. 94-117). Cambridge, UK: Cambridge University Press.

Schaie, K. W. (1990). Research methodology in the study of aging.​ In Q. C. Jing (Ed.), Methodological advances in developmental psychology. Beijing, China: Academia Sinica.

Schaie, K. W. (1990). So you want to do research in aging: Methodological constraints.​ In I. Parham, L. Poon, & I. Siegler (Eds.), Modules for teaching the psychology of aging (pp. 2.1-2.29). New York: Springer Publishing Co.

Schaie, K. W., & O’HanIon, A. M. (1990). The influence of social-environment factors in the maintenance of adult intelligence.​ ​​In R. Schmitz-Scheerzer, A. Kruse & E. Olbrich (Eds.), Altern – Ein lebenslanger prozess der sozialen interaktion [Aging – A lifelong process of social interaction] (pp. 56-66). Darmstadt, Germany: Steinkopf Verlag.

Field, D., Leino, V., & Schaie, K. W. (1991). Continuity in intellectual functioning: The role of personality. Mensa Research Journal, 30, 6-19.

Schaie, K. W. (1991). Intelligenz.​ In W. D. Oswald (Ed.), Handbuch der Gerontologie [Handbook of gerontology] (2nd ed., pp. 269-283). Stuttgart, Germany: Kohlhammer.

Schaie, K. W. (1991). Review of gerontological research methods in transition. Contemporary Psychology, 36, 587-588.

Schaie, K. W., Dutta, R., & Willis, S. L. (1991). The relationship between rigidity-flexibility and cognitive abilities in adulthood. ​Psychology and Aging, 6, 371-383.

Schaie, K. W., & Nesselroade, J. R. (1991). The crystallization of developmental trajectories — Commentary. Human Development, 34,180-183.

Schaie, K. W., & Willis, S. L. (1991). Adult personality and psychomotor performance: Crossectional and longitudinal analyses.​ Journal of Gerontology: Psychological Sciences, 46, 275-284.

Schaie, K. W. (1992). The impact of methodological changes in gerontology.​ International Journal of Human Development and Aging, 33, 19-29.

Schaie, K. W. (1992). Shifting levels of analysis in the investigation of cognitive aging — Commentary. Human Development, 33, 350-354.

Schaie, K. W., Plomin, R., Willis, S. L., Gruber-Baldini, A., & Dutta, R. (1992). Natural cohorts: Family similarity in adult cognition.​ In T. Sonderegger (Ed.), Psychology and aging: Nebraska symposium on motivation, 1991 (pp. 205-243). Lincoln, NE: University of Nebraska Press.

Schaie, K. W. (1993). Ageist language in psychological research. American Psychologist, 48, 49-51.

Schaie, K. W. (1993). The Seattle longitudinal studies of adult intelligence.​ Current Directions, 2, 171-175.

Schaie, K. W. (1993). The Seattle Longitudinal Study: A thrity-five year inquire of adult intellectual development.​ Zeitschrift für Gerontologie, 26, 129-137.

Schaie, K.W., Plomin, R., Willis, S. L., Gruber-Baldini, A., Dutta, R., & Bayen, U. (1993). Longitudinal studies of family similarity in intellectual abilities.​ In J. J. F. Schroots & J. E. Birren (Eds.), The next generation of longitudinal studies of health and aging (pp. 183 198). Amsterdam, The Netherlands: Elsevier.

Schaie, K. W., & Willis, S. L. (1993). Age difference patterns of psychometric intelligence in adulthood: Generalizability within and across ability domains.​ Psychology and Aging, 8, 44-55.

Schaie, K. W., & Willis, S. L. (1993). Everyday cognition: Taxonomic and methodological considerations.​ In H. W. Reese & J. Puckett (Eds.), Life-span develomental psychology: Training interventions (pp. 33-53). Hillsdale, NJ: Erlbaum.

Zelinski, E. M., Gilewski, M. J., & Schaie, K. W. (1993). Individual differences in cross-secional and 3-year longitudinal memory performance across the adult life span. Psychology and Aging, 8, 176-186.

Schaie, K. W. (1994). Adult intellectual development. In R. Corsini (Ed.), Encyclopedia of psychology (pp. 33-34). New York: Wiley.

Schaie, K. W. (1994). The course of adult intellectual development.​ American Psychologist, 49, 304-313. Also republished in Russian in the Russian Psychological Journal, 19, No. 6, 72-88 (1998).

Schaie, K. W. (1994). Developmental designs revisited.​ In H. W. Reese & S. H. Cohen (Eds.), Life-span developmental psychology: Methodological issues revisited (pp. 45-64). Hillsdale, NJ: Erlbaum.

Schaie, K. W. (1994). Primary mental abilities.​ In R. Corsini (Ed.), Encyclopedia of psychology (pp. l16-117). New York: Wiley.

Schaie, K. W. (1994). Sequential methods.​ In R. Corsini (Ed.), Encyclopedia of psychology (pp. 378-380). New York: Wiley.

Schaie, K. W., Willis, S. L, & O’Hanlon, A. M. (1994). Perceived intellectual performance change over seven years.​ Journal of Gerontology: Psychological Sciences, 49, 108-118.

Willis, S. L, & Schaie, K. W. (1994). Assessing competence in the elderly.​ In C. E. Fisher & R. M. Lerner (Eds.), Applied developmental psychology (pp. 339-372). New York: MacMillan.

Willis, S. L., & Schaie, K. W. (1994). Cognitive training in the normal elderly.​ In F. Forette, Y. Christen, & F. Boller (Eds.), Plasticité cérébrale et stimulation cognitive (pp. 91-113). Paris, France: Fondation Nationale de Gérontologie.

Diehl, M., Willis, S. L., & Schaie, K. W. (1995). Everyday problem solving in old adults — Observational assessment and cognitive correlates.​Psychology and Aging, 10, 478-491.

Gruber-Baldini, A. L., Schaie, K. W., & Willis, S. L. (1995). Similarity in married couples: A longitudinal study of mental abilities and rigidity-flexibility​. Journal of Personality and Social Psychology, 69, 191-203.

Schaie, K. W. (1995). Cohort-sequential longitudinal studies of personality and intelligence.​ In A. Kruse & R. Schmitz-Scherzer (Eds.), Psychologie der lebensalter (pp. 201-208). Darmstadt, Germany: Steinkopf.

Schaie, K. W. (1995). Entwicklung im Alter? Individuelle Voraussetzungen – gesellschaftliche Konsequenzen [Development in old Age? Individual Assumptions and Societal Consequences].​ In H.U. Klose (Ed.), USA: Alterung und Modernisierung [Aging and Modernization in the USA] (pp. 69-85), Bonn, Germany: Friedrich Ebert Foundation

Schaie, K. W. (1995). Training materials in geropsychology: Developmental issues. In B. G. Knight & L. Teri (Eds.), Mental health services for old adults: Implications for training and practice of geropsychology. Washington, DC: American Psychological Assocaiation.

Schaie, K. W., & Willis, S. L. (1995). Perceived family environments across generations.​ In V. L. Bengtson, K. W. Schaie, & L. Burton (Eds.), Adult intergenerational issues in aging (pp. 174-209). New York: Springer Publishing Co.

Schaie, K. W. (1996). Abilities.​ In G. L. Maddox (Ed.), Encyclopedia of Aging (2nd ed., p. 2). New York: Springer.Publishing Co.

Schaie, K. W. (1996). Abstract thinking​. In G. L. Maddox (Ed.), Encyclopedia of Aging (2nd ed., pp. 2-3). New York: Springer Publishing Co.

Schaie, K. W. (1996). Adulthood and old age. In T. Husen & T. N. Postlewaithe (Eds.), International encyclopedia of adult education and training. Oxford, UK: Pergamon Press.

Schaie, K. W. (1996). Generational differences.​ In J. E. Birren (Ed.), Encyclopedia of gerontology (Vol. 1, pp. 567-575). San Diego, CA: Academic Press.

Schaie, K. W. (1996). Human development: Aging. In A. C. Tijnman (Ed.), The international encyclopedia of adult education and training (2nd ed., pp. 343-353). Oxford, UK: Elsevier Sciences.

Schaie, K. W. (1996). Intellectual development in adulthood.​ In J. E. Birren & K. W. Schaie (Eds.), Handbook of the psychology of aging (4th ed., pp. 266-286). San Diego, CA: Academic Press.

Schaie, K. W. (1996). Intelligence.​ In G. L. Maddox (Ed.), Encyclopedia of Aging (3rd ed., pp. 513-514). New York: Springer Publishing Co.

Schaie, K. W. (1996). Longitudinal research.​ In G. L. Maddox (Ed.), Encyclopedia of Aging (3rd ed., pp. 575-576). New York: Springer Publishing Co.

Schaie, K. W. (1996). The natural history of a longitudinal study.​ In M. Merrens & G. Brannigan (Eds.), The developmental psychologists (pp. 233-249). New York: McGraw Hill.

Schaie, K. W. (1996). Research methods in gerontology.​ In G. L. Maddox (Ed.), Encyclopedia of Aging (3rdd ed., pp. 812-815). New York: Springer Publishing Co.

Schaie, K. W. (1996). Rigidity.​ In G. L. Maddox (Ed.), Encyclopedia of Aging (3rd ed., pp. 830-831). New York: Springer Publishing Co.

Schaie, K. W., & Willis, S. L. (1996). Psychometric intelligence and aging.​ In F. Blanchard Fields & T. M. Hess (Eds.), Perspectives on cognitive change in adulthood and aging (pp. 293-322). New York: McGraw-Hill.

Bosworth, H. B., & Schaie, K. W. (1997). The relantionship of social environment, social networks, and health outcomes in the Seattle Longitudinal Study: Two analytical approcahes.​ Journal of Gerontology: Psychological Sciences, 52, 197-205.

Schaie, K. W. (1997). Normal cognitive development in adulthood. In H. Fillit & R. N. Butler (Eds.), Cognitive decline: Strategies for prevention (pp. 9-21). London, UK: Grenwhch Medical Media.

Allen-Burge, R., Willis, S. L., & Schaie, K. W. (1998). The aging personality and self.​ In R. Tallis, H. Fillit, & J. C. Brocklehurst (Eds.), Geriatric medicine and gerontology (pp. 153-188). Edinburgh, UK: Churchill Livingstone.

Schaie, K. W. (1998). Advances in longitudinal research methodology. Australian Journal of Ageing. 17, (1, Supplemental), 78-81.

Schaie, K. W. (1998). Intellectual development in adults.​ Psikhologihskii Zhurnal, 19, 72-89

Schaie, K. W., Maitland, S. B., Willis, S. L., & Intrieri, R. C. (1998). Longitudinal invariance of adult psychometric ability factor structures across seven years.​ Psychology and Aging, 13, 8-20.

Schaie, K. W., & Willis, S. L. (1998). Towards implementing the results of empirical findings on human aging.​ In H. Reents (Ed.), Handbuch der gerontotechnik [Handbook of gerotechnology] (2nd ed.). Iserlohn, Germany: Ecomed.

Willis, S. L., & Schaie, K. W. (1998). Intellectual functioning in midlife.​ In S. L. Willis & J. Reid (Eds.), Life in the middle (pp. 233-247). San Diego, CA: Academic Press.

Bosworth, H. B., Schaie, K. W., Willis, S. L., & Siegler, I. C. (1999). Age and distance to death in the Seattle Longitudinal Study.​ Research on Aging, 21, 723-738.

Bosworth, H. B., Schaie, K. W., & Willis, S. L. (1999). Cognitive and sociodemographic risk factors for maortality in the Seattle Longitudinal Study.​ Journals of Gerontology: Psychological Sciences, 54, 273-282.

Bosworth, H. B., & Schaie, K. W. (1999). Survival effects in cognitive function, cognitive style, and sociodemographic variables in the Seattle Longitudinal Study.​ Experimental Aging Research, 25, 121-139.

Schaie, K. W., & Willis, S. L. (1999). Theories of everyday competence and aging.​ In V. L. Bengtson & K. W. Schaie (Eds.), Handbook of theories of aging (pp. 174-195). New York: Springer Publishing Co.

Willis, S. L., & Schaie, K. W. (1999). Intellectual functioning in midlife. In S. L. Willis & J. Reid (Eds.), Life in the middle (pp. 233-247). San Diego, CA: Academic Press.