[Stoves] Stove variables display diagram

[Richard Stanley]

Crispin et al; 
That got me thinking: What about a vertical axis added to reflect effects of time on the given variables: Durability (stove amortization), payback period based on for fuel saved,  or user acceptance, it might look like this,eh? (Interior concentric septimagon profile not shown to avoid utter confusion):
 

Richard, freezing in NIcaragua


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On Mar 11, 2014, at 10:48 AM, Crispin Pembert-Pigott wrote:

Dear Ron
 
I have spoken to Cecil and he will provide us a synopsis.
 
A spider diagramme is a common way to show how products compare when measured using numerous dimensions.  Here is one displaying graphically the properties chewing gum:
 

 
By using a ‘high’ rating for the centre and a ‘low’ rating at the outside edge, one can create informative charts for as many properties as you want.
 
Social science metrics include preferences, fuels, controllability, lighting time, ease of learning to use it, appearance, comparison with other products such as traditional stoves or competing improved stoves, working life, ease of maintenance, ability to accommodate a range of pots or multiple pots, price, installation cost, transport to the home issues, attention demand, fuel preparation requirement, safety concerns, space heating, light casting, clothes drying ability, fuel drying ability, thermal mass heat storage, fuel flexibility and many others relating to opinions of users or observers. Perception of modernity is another.
 
As Verena Brinkmann said at the ISO meeting in Kenya, it is difficult to measure everything so what is needed is a list of things one might report, and a toolbox of methods that are used for each item. I was surprised at the use of the term ‘toolbox’ because that is exactly what I propose as a suitable method of determining stove performance across a wide range of devices, pots, foods, fuels and user habits. If the measurement you want is relative performance in the place where you plan to sell stoves, then the test of performance has to be relevant to those circumstances and ‘relevant’ includes many social dimensions.
 
If you want to measure the things that are important to the stove users, you first have to know what they think is important and then see if the product addresses those needs or shortcomings well. In the case of funded projects, the ‘customer’ is both the funder and the end user so there are additional measurements required.
 
By making a spider diagramme or spider chart on can put on the table those things which the project and users feel are important and rate products more easily and present comparisons in a pretty small space. In the chart above you can see that the green product line is inside all the others on every count. That might be a stove scoring better than other stoves on every score no matter how many scores one is tracking.
 
Regards
Crispin
 
 
Crispin:
 
                If it is difficult to send a chart or two, could you identify the Cecil Cook nine variables?
 
Ron
 
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