Many issues arise in implementing a task-based approach. To begin with, there
is little evidence that it works any more effectively than the P-P-P approach it
seeks to replace. Criteria for selecting and sequencing tasks are also problematic,
as is the problem of language accuracy. Task work may well serve to develop
fluency at the expense of accuracy, as with some of the other activities suggested
within a CLT framework. Content issues are also of secondary importance
in TBI, making it of little relevance to those concerned with CBI or mainstreaming.
The fact that TBI addresses classroom processes rather than learning
outcomes is also an issue. In courses that have specific instructional outcomes to
attain (e.g., examination targets) and where specific language needs have to be
addressed rather than the general communication skills targeted in task work,
TBI may seem too vague as a methodology to be widely adopted.