This paper describes some of the complex relationships that exist betw
een R&D (research and development) and M&S (marketing and sales). Fact
ors impacting R&D and M&S are analysed such as company size, company a
ge, wishes for changes in the individual company, etc. Seven propositi
ons are presented. One specific finding from the study is that, for di
fferent product life cycles (PLCs), R&D and M&S often counteract so th
at when R&D spendings are allowed to increase, M&S spendings are reduc
ed and vice versa. Management of technology (MoT) is not an exact scie
nce, and therefore the paper focuses on magnitudes of order instead of
decimals in R&D and M&S expenditures for individual companies dependi
ng on branch, and differing situations. One important result of the in
vestigation is that short PLCs means larger R&D spendings, and vice ve
rsa. (C) 1998 Elsevier Science Ltd. All rights reserved.