Planning and Executing Credible Experiments. Robert J. Moffat
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Название: Planning and Executing Credible Experiments
Автор: Robert J. Moffat
Издательство: John Wiley & Sons Limited
Жанр: Физика
isbn: 9781119532866
isbn:
It is difficult for some project managers to sign off on such a statement as, “The answer to this question, with no other benefit, will justify the cost of this experiment.” Lurking in the back of most minds are hopes for “spin‐off data,” bits of knowledge they hope to get, or a general feeling that the experiment ought to be “kept loose, so we can steer it as we go.” These urges usually arise out of reluctance to come to grips with the specific problem: what is it that we really must know?
I recommend organizing a “signing party” at which the people with a stake in the issue sign off on the question, the form of its answer, and the uncertainty. Too often, higher management pays little or no attention to these “philosophical issues” until too late. There is something about deliberately signing off that makes people pay attention.
Unless there is explicit agreement, early, on the objective of the experiment, a host of serious issues may ensue:
Disagreements on “what to do next.”
Dissatisfaction with the outcome.
“Second guessing” after the final report.
A general whitewashing to cover up the lack of definite progress.
Too many experiments simply don’t answer any question – they only contribute some facts that may or may not be useful.
Reference
1 Platt, J.R. (1953). Address before the Division of Physical Chemistry. American Chemical Society.
Homework
1 4.1 Propose at least three potential motivating questions that your experiment can answer.
2 4.2 Discuss with your client each of the potential motivating questions. Which one is preferred?
3 4.3 What questions does your client raise in light of the preferred motivating question?
4 4.4 How can this motivating question be refined? Can it be made more concrete?
5 4.5 Can your motivating question be clearly achieved?
6 4.6 Rinse and repeat from Exercise 4.1.
Notes
1 1 Upon my (Moffat) retirement from active teaching, my recent graduates presented me with a memorial plaque bearing a gold‐plated piece of rope and the legend “You Can't Push a Rope.” This saying is one of the first major lessons every engineer learns in the course Statics, when she/he draws forces on an object.
2 2 On an exam in a graduate heat‐transfer course, I once asked: “When can equation 8‐16 be used?” One student responded, “On Thursday!” What could I say!
3 3 In one program, it took nearly a year to get the final form of the question worked out. The rig was nearly ready for shakedown runs before we were content. That question, written on a 3 × 5 card and thumbtacked to the wall in the office, guided our research through three PhD theses.
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