1980

Baltes, P. B., Cornelius, S. W., Spiro, A., Nesselroade, J. R., & Willis, S. L. (1980). Integration vs. differentiation of fluid-crystallized intelligence in old age. Developmental Psychology, 16, 625-635.

Willis, S. L., & Baltes, P. B. (1980). Intelligence in adulthood and aging: Contemporary issues. In L. Poon (Ed.), Aging in the 1980s: Psychological issues (pp. 260-272). Washington, DC: American Psychological Association.

1981

Blieszner, R., Willis, S. L, & Baltes, P. B. (1981). Training research in aging on the fluid ability of inductive reasoning. Journal of Applied Developmental Psychology, 2, 247-265.

Hofland, B. F., Willis, S. L., & Baltes, P. B. (1981). Fluid intelligence performance in the elderly: Intraindividual variability and conditions of assessment. Journal of Educational Psychology, 73, 573-586.

Schaie, K. W., & Willis, S. L. (1981). Maintenance and decline of adult mental abilities: I. Empirical data and explanatory models. In F. Grote (Ed.), Ninth symposium on learning: Adult learning and development. Bellingham, WA. Western Washington University.

Willis, S. L., & Baltes, P. B. (1981). Derivation of gerontological training research from the Gf-Gc theory of intelligence: A reply to Donaldson and some critical observations. Journal of Gerontology, 36, 634-638.

Willis, S. L., Baltes, P. B. & Cornelius, S. W. (1981). Development and modifiability of adult intellectual performance: An examination of cognitive intervention in later adulthood. In M. Friedman and J. P. Das (Eds.), Intelligence and learning (pp. 169-178). New York: Plenum.

Willis, S. L., Blieszner, R., & Baltes, P. B. (1981). Intellectual training research in aging: Modification of performance on the fluid ability of Figural Relations.Intellectual training research in aging: Modification of performance on the fluid ability of Figural Relations.Intellectual training research in aging: Modification of performance on the fluid ability of Figural Relations. Journal of Educational Psychology, 73, 41-50.

Willis, S. L., & Schaie, K. W. (1981). Maintenance and decline of adult mental abilities: II. Susceptibility to experimental manipulation. In F. Grote (Ed.), Ninth symposium on learning: Adult learning and development. Bellingham, WA. Western Washington University.

1982

Baltes, P. B., & Willis, S. L. (1982). Plasticity and enhancement of intellectual functioning in old age: Penn State’s Adult Development & Enrichment Project (ADEPT). In F. I. M. Craik & S. E. Trehub (Eds.), Aging and cognitive processes (pp. 353-389). New York: Plenum Press.

Lachman, M. E., Baltes, P. B., Nesselroade, J. R., & Willis, S. L. (1982). Examination of personality-ability relationships in the elderly: The role of the contextual (interface) assessment mode. Journal of Research in Personality, 16, 485-501.

Schaie, K. W., & Willis, S. L. (1982). Life span development. In H. E. Mitzel (Ed.), Encyclopedia of Educational Research (5th edition). Washington, DC: American Educational Research Association Publications.

Willis, S. L. (1982). Concepts from life span developmental psychology: Implications for programming. In M. Okun (Ed.), New directions for continuing education: Programs for older adults (pp. 3-10). San Francisco: Jossey-Bass.

1983

Cornelius, S. W., Willis, S. L., Nesselroade, J. R., & Baltes, P. B. (1983). Convergence between attention variables and factors of psychometric intelligence in older adults. Intelligence, 7, 253-269.

Willis, S. L., Cornelius, S. W., Blow, F. C., & Baltes, P. B. (1983). Training research in aging: Attention processes. Journal of Educational Psychology, 75, 257-270.

1985

Willis, S. L. (1985). Towards an educational psychology of the adult learner. In J. E. Birren & K. W. Schaie (Eds.), Handbook of the psychology of aging (2nd edition, pp. 818-847). New York: Van Nostrand Reinhold.

1986

Schaie, K. W., & Willis, S. L. (1986). Can decline in adult intellectual functioning be reversed? Developmental Psychology, 22, 223-232.

Willis, S. L., & Schaie, K. W. (1986). Practical intelligence in later adulthood. In R. Sternberg & R. Wagner (Eds.), Practical intelligence: Origins of competence in the everyday world (pp. 236-270). New York: Cambridge University Press.

Willis, S. L., & Schaie, K. W. (1986). Training the elderly on the ability factors of spatial orientation and inductive reasoning. Psychology and Aging, 1, 239-247.

1987

Willis, S. L. (1987). Cognitive training and everyday competence. In K. W. Schaie (Ed.), Annual review of gerontology and geriatrics (Vol. 7, pp. 159-188). New York: Springer Publishing Co..

Schaie, K. W., Willis, S. L., Hertzog, C., & Schulenberg, J. E. (1987). Effects of cognitive training on primary mental ability structure. Psychology and Aging, 2, 233-242.

1988

Cooney, T. M., Schaie, K. W., & Willis, S. L. (1988). The relationship between prior functioning on cognitive and personality dimensions and subject attrition in longitudinal research. Journal of Gerontology: Psychological Sciences, 43, 12-17.

Garfein, A. J., Schaie, K. W., & Willis, S. L. (1988). Microcomputer proficiency in later-middle-aged and older adults: Teaching old dogs new tricks. Social Behavior, 3, 131-148.

Willis, S. L., & Schaie, K. W. (1988). Gender differences in spatial ability in old age: Longitudinal and intervention findings. Sex Roles, 8, 189-203.

Willis, S. L. (1988). An integrated treatment of adult development. [Review of Adult development (2nd ed.)]. Contemporary Psychology, 33, 706-707.

1989

Schaie, K. W., Willis, S. L., Jay, G., & Chipuer, H. (1989). Structural invariance of cognitive abilities across the adult life span: A cross-sectional study. Developmental Psychology, 25, 652-662.

Willis, S. L. (1989). Cohort differences in cognitive aging: A sample case. In K. W. Schaie & C. Schooler (Eds.), Social structure and aging: Psychological processes (pp. 95-112). New York: Erlbaum.

Willis, S. L. (1989). Improvement with cognitive training: Which old dogs learn what tricks? In L. Poon, D. Rubin, & B. Wilson (Eds.), Everyday cognition in adulthood and late life (pp. 545-569). Cambridge, MA: Cambridge University Press.

Willis, S. L. (1989). Adult intelligence. Adult intelligence. Adult intelligence. In S. Hunter & M. Sundel (Eds.), Midlife myths (pp. 97-111). Beverly Hills, CA: Sage.