John Swinney is finding it difficult to achieve a distinctive image.
Sharon Maurer, president of Community School Board 26, said it would be difficult to achieve "a unified vision" for a three-school campus involving three jurisdictions.
Men with facial hair may find that it is difficult to achieve a good seal no matter how tight the straps are.
Israel's leaders know that, given the state of the Gaza Strip, it will be difficult to achieve a total, unambiguous military victory.
Latvians found it difficult to achieve a unified view of the world in the 20th century, however, and so turned to psychological detail.
Woodroffe said: "The problem seemed to be that badger sets are built to hold warm air in and keep cold draft out, so it was very difficult to achieve a lethal concentration of gas.
As a higher level teaching assistant (HTLA) in the maths department, she works closely with students who are expected to find it difficult to achieve a C in maths.
Clementi said it would be difficult to "achieve a clear separation" of BBC Trust and BBC, noting that even if it was possible, there would still be the issue of "two organisations sitting in one legal entity".
Whilst exact parity in the boardroom may be difficult to achieve, a board with less than 40% men or women is not gender balanced and will miss out on the benefits that diversity brings.
As things have turned out, given the views and the people within the party, and the response as received, and it was always going to be difficult to achieve a non-catastrophic outcome.
When settlements are described as the issue, we lose sight of the fundamentals of the historic Arab war against Israel, and we make it even more difficult to achieve a breakthrough.
