14.10.2015 Views

100-Metodos-de-Qualidade-Total

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

DATA COLLECTION, ANALYSIS AND DISPLAY 223<br />

Method 97<br />

Tree diagrams<br />

Purpose<br />

To i<strong>de</strong>ntify the tasks and methods nee<strong>de</strong>d to solve a problem and reach a<br />

goal.<br />

When to use<br />

When you want to break down vaguely formulated customer wishes about<br />

a product into customer requirements on a manageable level, or to<br />

investigate all possible aspects of customer wishes that present a problem.<br />

Tree diagrams can be used to <strong>de</strong>velop short-term goals before finalizing<br />

long-term goals.<br />

How to use<br />

Build a 'tree' systematically from a statement of a goal through headings to<br />

'branches' of plans and action. Trees are best <strong>de</strong>veloped as a team.<br />

General issues are subdivi<strong>de</strong>d into specific issues. A particular use of this<br />

structure is that of a 'fault tree' where the tree structure is used in a cause<br />

and effect fashion to analyse causes of faults.<br />

Easy to handle<br />

Problem<br />

Cause A<br />

Easy to adjust<br />

Cause B<br />

Easy access<br />

I Cause C I--<br />

Easy to hold<br />

I Cause A 1 I<br />

Easy to grip<br />

Cause A2<br />

Simple mechanism<br />

Cause B 1<br />

Simple equipment<br />

Cause B2<br />

Small handle<br />

Cause C1<br />

Adjustable grip<br />

I Cause C2 I<br />

Figure 1<br />

Tree diagram

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!