Project Management Methodology Quality Control Diagrams Seven basic tools of quality.

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Presentation transcript:

Project Management Methodology Quality Control Diagrams Seven basic tools of quality

Quality control tools Special tools used to monitor project parameters to ensure that they are compliant with the relevant quality standards Quality metrics and diagrams (Pareto charts, Fish bones, others)

Fishbone diagram Used to discover and enumerate the factors that can impact the product quality Is in fact the tree to show first biggest factors (skeleton) with the branches showing decompositions

Fishbone sample – Purple Team (Andy, Kurtis, Peter, Yuri)

Control Chart Used to control processes It is built to verify whether we have enumerated all the factors that impact the process If yes, we can rely on available methods of evaluation and can use them to predict the future If not, we should perform additional analysis to discover invisible factors

Control Chart Measurements The process quality characteristics measurements upon the timeline Calculated Center line (e.g. average per hour) Standard errors (deviation that is considered standard Upper limit and lower limit, define the corridor where deviations are acceptable

Control Chart If measured values are in the corridor the process is under control If they are located beyond the corridor – some unknown factors exists that impact the process Current model is not reliable, improvements required

Control Chart sample – yellowsnake team (Japheth, Mario, Milton)

Comments The process – vulnerability assessment Measurement – number of false positive Center line – average per period Standard error – expected deviation Upper limit (3 time more) Lower limit (3 time less) Result – some values are beyond the corridor, the process is not under control

Run Chart Used to see the trend of changes in measurements for a given quality characteristic in a time sequence Measurement The characteristic values in a time sequence

Run Chart sample - The Green Team – Adam, Liane, Paul, Matt

Scatter diagram Used to analyze correlations that exists between two factors Factors can be any, not necessarily time Measurements: The pairs of values for the characteristics measured in a time sequence

Scatter Diagram sample – Orange team (Shayne, Todd, Yash, Tim)

Histogram Used to plot density of data Measurement Values in pairs to show how many occurrences of A pertain to a given value of B A and B can be anything, not necessarily time

Histogram sample – Brown team (Kowrian, Mike, Nahin, Ou)

Pareto charts Used to identify and prioritize problem areas (aka 80/20 rule) Read “80% of problems are caused by 20% of reasons” The diagram collect stats of a problem occurrences Use Bar Charts to indicate most common quality problem causes—address these first (taking severity into account of course)

Pareto Chart Measurements Number of occurrences by identified problems within a given period of time Calculation Total number of occurrences Percent of occurrences of each factor rated against total number of occurrences Drawing Horizontal axe – problems Left vertical axe – frequency of occurrence Right vertical axe

Pareto Chart Drawing Horizontal axe – problems Left vertical axe – frequency of occurrence Right vertical axe – cumulative percent of occurrences Reading Draw a line at 80% on y-axis parallel to x-axis. Then drop the line at the point of intersection with the curve on x-axis. This point on the x-axis separates the important causes on the left and less important causes on the right. Result Problems to the right from the vertical line are most important

Pareto Chart sample – Blue team (Jamal, Trevor, Ben, Manav)

Flaw chart Used to study the process, step-by-step Decision blocks must be included Parallel activities must be shown

Flaw chart sample