Bad variety

We can summarize the discussion by drawing a picture illustrating the hierarchy of good and bad varieties ... 

Elucidations on using good and bad varieties of gold and silver and... 

The 80/20 rule is one of the best ways to measure variety. What this rule states is that 20% of causes contribute to 80% of the results. The 20% of the businesses, customers, employees, processes, facilities, and products that contribute to 80% of the revenues, economic surplus, and cash flow represent good variety. The 20% of the business, customers, employees, processes, facilities, products, and suppliers that contribute to 80% of the economic losses and unproductive assets represent bad variety. 

Distinguish between good and bad variety in terms of businesses, and within the businesses, in terms of customers, employees, products, processes, fecilities, and suppliers. 

Starve the bad variety and make it shrink. More importantly, prevent it from dragging the rest ofthe organization down, and draining the energy, enthusiasm, and excitement of scarce management talent. 

Waste water rules have pH limits, a common range being between 6 and 10. There are also limits for fats and oils, solvents, heavy metals, and a variety of other compounds and ions. The fact that a compound with possible toxic or otherwise undesirable properties is not on the list does not mean it is permissible. Such a matter should be discussed with the proper authorities. The discharged water may also have to pass a test for toxicity to aquatic animals. As one frustrated manager of a chemical plant put it We can no longer put anything but pure tap water into the sewer Of course, it is not really that bad, but some of the requirements often come as a surprise. 

Some elucidation of the mechanism of elastomer reinforcement is being obtained by precipitating chemically-generated fillers into network structures rather than blending badly agglomerated filler particles into elastomers prior to their cross-linking. This has been done for a variety of fillers, for example, silica by hydrolysis of organosilicates, titania from titanates, alumina from aluminates, etc. [85-87], A typical, and important, reaction is the acid- or base-catalyzed hydrolysis of tetraethylorthosilicate ... 

Despite the bad reputation of thalidomide, it has since proved useful in alleviating a variety of disorders such as rheumatoid arthritis, leprosy,... 

Complex pyrolysis chemistry takes place in the conversion system of any conventional solid-fuel combustion system. The pyrolytic properties of biomass are controlled by the chemical composition of its major components, namely cellulose, hemicellulose, and lignin. Pyrolysis of these biopolymers proceeds through a series of complex, concurrent and consecutive reactions and provides a variety of products which can be divided into char, volatile (non-condensible) organic compounds (VOC), condensible organic compounds (tar), and permanent gases (water vapour, nitrogen oxides, carbon dioxide). The pyrolysis products should finally be completely oxidised in the combustion system (Figure 14). Emission problems arise as a consequence of bad control over the combustion system. 

The first level of treatment, with sand filters and chlorination to remove suspended matters and disinfection of pathogens, may be good enough for the low-cost water. The removal of discoloration and bad smell is accomplished by activated charcoal absorption. Ozone and ultraviolet treatments are much more expensive for the removal of microbes and organic matter, and should be considered only when necessary to solve a technical problem, or to satisfy an advertisement need. Reverse osmosis is the most effective method used to recover clean water from brackish water, and to remove inorganic minerals such as sodium, copper, iron, and zinc. The removal of calcium and magnesium ions can be accomplished by the method of ion exchange with sodium, which would also increase the sodium concentration, and could cause objections. Different levels of treatment require a variety of costs, and can produce different levels of customer satisfaction. 

---