The phrase "difficulty of assessing" is grammatically correct and can be used in written English.
Example sentence: One of the biggest challenges faced by educators is the difficulty of assessing students' learning progress accurately.
But that only underscores the difficulty of assessing advertising's effectiveness.
It also explores the difficulty of assessing efficiency benefits in advance of mergers and suggests alternative approaches to the problem.
A possible reason why a teaching excellence framework does not exist, it was mooted, is the difficulty of assessing lecturers' competence.
Rather, here, as we have done in the past, we rest our conclusion of structural error upon the difficulty of assessing the effect of the error.
The difficulty of assessing risk emerges in places like Los Angeles, where the Superior Court conducts a relatively thorough review of firearms rights requests.
The difficulty of assessing the continuing damage to the gulf was underscored Monday in conflicting testimony before the commission investigating the causes of the accident.
Correlations are developed and proposed for turboprop and turboshaft engines to overcome the difficulty of assessing exhaust emissions from these engines in absence of industry data.
The authors pointed out the limitations of the study, such as self-reported food intake, the difficulty of assessing organic food consumption in particular, and the likelihood of residual confounding.
The risk in buying an Indian bank, says Bart Hellemans, managing director of ING Vysya, lies in the difficulty of assessing the quality of its assets, customer data, contingent liabilities and distribution skills.
However, all this flexibility comes with a catch: as the combinatorial complexity of optional design features and deployment variability increases, the difficulty of assessing system qualities such as scalability and quality of service increases too.
In large measure because of the difficulty of assessing public involvement in the Supporting Organizations, it is unclear whether ICANN has been successful at collecting commentary that is representative of the Internet user community through its full range of user input methods.
