The phrase "assignment difficulties" is correct and usable in written English.
It can be used when discussing challenges or obstacles related to completing an assignment or task.
Example: "Many students face assignment difficulties, especially when the subject matter is particularly challenging."
Alternatives: "challenges with assignments" or "issues with assignments".
If a clearly defined rubric is also included then the variability in assignment difficulty can be minimized.
The proteins are of moderate size for typical NMR studies, and this collection has representative structural diversity and assignment difficulty.
In the previous study form our group, subject recruitment was hampered by the unwillingness of some subjects to consider the possibility of corticosteroid treatment assignment and the difficulty some patients or their parents had in being assigned to a placebo group.
First, whereas Parkinson's law suggests that longer deadlines lead people to set easier goals and therefore decrease effort, we found that longer deadlines increase an assignment's perceived difficulty.
Unfortunately, among both faculty and students some teaching hours are more popular than others, with the result that more courses are offered on certain days and hours than others, and faculty and students continue to be frustrated by their classroom assignments and scheduling difficulties.
Although there are other programs for secondary structure assignment, we had difficulty finding distributions that we could download.
Each writing assignment increased in difficulty as it called for students to integrate several science process skills and required them to work at progressively higher cognitive levels (see Figure 7).
Another difficulty was related to the heterogeneity of the student body, which is a well-known challenge in continuous adult education [ 45]: it can partly be resolved through personal assignments of different difficulties according to the students' level, thus designing a more student-centered program [ 41].
"Teachers also bring expertise in judgment from experience on similar tasks, giving them insight into various ways to solve the assignment and in the difficulties previous learners encountered" (p. 144).
Besides the discontinuation of follow-up due to restructuring and closing, 3 of 22 intervention worksites gave up the intervention assignment due to different difficulties, but were still participating in follow-up (1 production factory in the pharmaceutical company, 1 nursing home, 1 institution).
