Flavor of the Month is a book by Joel Best about what he calls institutional fads. Institutional fads are the short-lived enthusiasms that plague business, education, health, and science. Particularly, this is a social psychological account of how they manifest, and what motivates people throughout the process.
Best starts by outlining what he means by "fad." Simple examples, like the hula hoop illustrate the point: they are a product (or idea) that suddenly explodes in popularity before suddenly dropping off in popularity.
This is distinguished from things that actually embody progress, like the transition from pocket watches to wrist watches; interestingly, this was assumed to be a fad by many at the time.
Another term distinguished from fads would be fashions. Fashions are intermittent, unlike fads. While fads might cluster and be loosely connected, fashions are not only reliably shifting, but expected. Think movies. No one expects a movie to simply stick. Any and all movies are expected to be popular for a time and then drop off, which restarts the process.
Finally, Best distinguishes institutional fads from more generic fads. Obviously, there is a difference between hula hoops and the latest dieting fad. Notably, what he calls institutional fads have the potential for real world consequences and they are perceived as an instance of progress by many promoters.
Underlying Forces
This leads nicely into the next point. Best suggests that the driving force of institutional fads is American culture (or culture like America). Namely, our culture is fixed on progress. We believe that change is possible, that perfection is the goal, and that where we are currently is not good enough. Out of this springs our tendency to seize upon fads.
Best goes to great pains to emphasize that people are not necessarily mindless when it comes to jumping aboard the bandwagon, as is commonly assumed. Think of a doctor who is struggling with some syndrome that is not well understood. He has patients in need of treatment, he knows that his knowledge is lacking, and now he has a potential solution. He might not believe it, but he might think it is worth trying out. Either that, or he has good incentive to rationalize why it will work in his mind. I don't think Best is entirely clear about this, but while there are often understandable reasons for why people jump on these fad bandwagons, it is important to note that people are not doing this because they are justified. They may have reasons, but they are still flawed.
Best breaks up institutional fads into three phases, which must take place for it to qualify: emerging, surging, and purging.
Emerging
Emerging is the first stage, where the fad is introduced and selected from the alternatives. Best suggests that a "good story" is required, one that defines a problem and then presents a solution that has a number of characteristics about it: it is novel (promises change), it has an explanation (regardless of its efficacy; people like the illusion of rationality), it is supported by evidence (in this case it's usually anecdotal evidence because real research takes too long), it has mystery that brings intrigue (and which balances the desire for evidence), it has flexibility and breadth that allows for a wide ranging application in many fields (like innovations in management), it has a recipe made up of slogans to demonstrate its applicability, and it has status like being promoted by popular people.
There are also social networks that are utilized to spread ideas, both formal and informal. People can take part in conventions where ideas are shared, or have personal connections with those in other industries, which allows for dissemination of ideas.
As for the process, it is driven by three main kinds of actors: originators, promoters, and trendsetters. They create the ideas, shares them via books, and lead by example, respectively.
Finally, Best comments that institutional fads can lean towards fashions, given that people cycle through them so easily, but it is still important to understand that fashions are distinguished by the fact that they are accepted as transient, while institutional fads are perceived as part of progress.
Surging
Surging refers to the enthusiastic spread of the fad as everyone jumps aboard the bandwagon. There is an emotional component to this, but also a calculated component for individual actors, and then there are the holdouts who do not join in for whatever reason.
The emotions associated with surging include comfort at joining with the rest of the people, shame at feeling left out, distaste towards those "sticks in the mud" who refuse to go along, and an associated feeling of superiority for being part of the progress.
Despite the fact that emotions are at the center of the motivational complex in human behavior, this does not mean that they are completely mindless or without reasons (irrational, in Best's language). This has already been touched upon, with individual actors often having personal benefits for jumping aboard, like a new employment opportunity as new positions open up for the purposes of pushing the fad. Basically, the biggest reason is careerism.
As for the "sticks in the mud," these people are not necessarily the rational ones in the situation. There are a number of reasons why people don't jump aboard, or are late to the party, ranging from lack of awareness to cynicism. But one thing does hold generally: they do not jump aboard late because they waited for the evidence. Instead, it is much the same as everyone else, they are following those they admire and want to be part of the enthusiasm. The irony is that the first adopters are usually beginning to drop the fad at this point.
Other constraints might play a part, as well, such as principled stances, like on the issue of spanking, or due to institutional inertia, where institutional structures resist major changes that might be proposed by a new innovation.
Purging
But a fad is not a fad without a purging. Purging is the final stage of the fad cycle, where people discretely discard the practices in favor of the newest one. Most notably, evidence is not even the motivation behind most purgings. Oftentimes, things are not purged when they should (as was the case for DARE), while others are purged before the evidence even comes to light.
Part of the reason fads are purged is for the same reason some fashions fall out of favor: it is no longer fashionable, or trendy. In addition, the anecdotal evidence of their own experience fails to live up the expectations, which dulls the enthusiasm that preceded the whole affair.
Best mentions two kinds of triggers that account for the decline of a fad: collapse triggers and elimination triggers. The former is simply the growing disenchantment with an adopted innovation, while the latter is growing interest in some replacement method.
And then, it is important to remember that there are those who cling on, suggesting the fad wasn't properly tried due to funding or lack of engagement.
There are a number of different ways of viewing fads those are both positive and negative. Some suggest that there is emotional fulfillment involved, others suggest that the behaviors throughout are rational but just uncertain, while others are entirely negative, suggesting that they are a timesink and a moneysink and are best avoided.
Fad Dynamics
There are a number of different visual analogies that can be used to think about fad dynamics. Those involved in a fad view the process as a staircase, with each step another movement towards perfection. Another view, one more cynical, is the pendulum, where people swing back and forth between two extremes like between top-down management and bottom-up management practices. Best disputes this, however, suggesting that there are many different dimensions on which things differ, meaning that top-down and bottom-up management practices can vary in a variety of different ways. Another analogy is a wave, with repeated cycles implying similarity, but with some change. A fourth analogy is the ratchet, which applies to fads that have institutional backing to them, preventing a purging. Oftentimes, laws are passed, and despite their ineffective nature, they resist reversal. For example, crack laws were the result of a craze that made punishment far harsher than cocaine. But no politician is going to advocate for reducing crack sentencing, so it isn't likely to change.
All these analogies are just simplified models, not capturing the complexity of the actual situation. Fads take time to spread and are never universal, with some institutions taking up the fads as other purge. There are also often multiple innovations that are taken up at a time, each with their own cycle that is not necessarily in sync with others. And finally, fads sometimes do have lasting impact, if not holistically; vestiges often remain.
Fad-Proofing
Best ends the book by talking about how to avoid fads, or at least lessen their impact. He gives five guidelines to follow: Don't forget what happened the last time (instead of thinking this is some isolated watershed moment, know that this is yet another suggested innovation with a possibility of failure), be skeptical of bold claims (like ask why it hasn't been tried before and what the costs are), insist on persuasive evidence (so don't rely on anecdotes), don't be driven by the fear of being left behind (namely by thinking about the costs of jumping aboard), and remember that people rarely proclaim their failures (so the anecdotes that people have access to are a biased sample).
The solutions are vague and obvious, so I'm not sure how useful they are in actual practice, but when human nature is the threat, what can you do?