In the grass alongside the railways tracks, especially at favored jumping-on points, concrete posts have been planted to trip people as they run to climb aboard, sometimes causing them to fall under the wheels.
"But at the same time," he adds, "we still have to build up the knowledge base so that when conditions change in the broader political sphere, we can point to concrete evidence and concrete strategies that may make an effect".
At first blush, Smolin's ideas sound like a formidable starting point for concrete experimentation.
At that point, no concrete deal was reached, with Benn exiting out the back and refusing to confirm that he was still in his job.
It is so rare, when dealing with issues as ingrained and insidious as sexual violence, to be able to point to concrete solutions that could make a real difference.
To underscore the point that concrete consequences will follow its guiding philosophy, the Nuclear Posture Review is scheduled to be released along with the Obama administration's next budget in February.
Bush aides also believe that the issue allows them to point to concrete accomplishments and statistics in Texas that demonstrate Mr. Bush's effectiveness in a given area of public policy.
Crucially, steps must be taken to measure the impact of OGD initiatives so that when tough choices have to be made, we can point to concrete gains and benefits already secured.
PETER MAASS: I'll get to your question in a second but let me just say that all of these questions are terrific; I'm not going to be able to answer all of them, but wow, they're great… PETER MAASS: First point: In concrete terms, I don't think I have any expectations.
After this point, the concrete cracks and strength decrease gradually to zero (Willam and Warnke 1975).
