This study is an empirical investigation into the operation of control
systems in large audit firms in Ireland. All audit seniors in three B
ig 6 firms were included in a postal survey. The results showed eviden
ce of under-reporting of time, premature sign-off and other audit qual
ity reduction acts. The analysis was extended beyond that reported in
previous studies by developing regression models to explain these thre
e types of dysfunctional behavior. Perceived attainability of time bud
gets and the leadership style of audit managers had a significant infl
uence on dysfunctional behavior, but the perceived amount of emphasis
on meeting budgets did not. Although organizational commitment was a f
urther explanatory variable, professional commitment was not. Perceive
d effectiveness of audit review procedures was found to be significant
ly associated with lower levels of premature sign-off and other qualit
y reduction acts, while the explicit and implied approval of superviso
rs was significant in the under-reporting of time decision. The discus
sion identifies two important types of informal control, and suggests
that audit firms need to address a number of key issues in order to im
prove the effectiveness of their formal control systems. The study con
tributes to the literature on management control by examining the impa
ct on individual behavior of a widely used formal control system. Furt
hermore, while previous studies in an audit setting have tended to rep
ort perceived influences on auditor behavior, or the outcome of testin
g involving a single variable, this study constitutes an extension of
earlier work by examining the combined effect of specific variables on
actual behavior, as reported by practising auditors.