All  Engineering and Technology Information in One Place.....


About This Site

Sections  Directory

Search This Site

Privacy Policy

Tired of looking for a job?, Cansado de buscar trabajo?





Semiconductors Devices


Electronics Technology Information Sites


Science and Tech Forum


Electronics Engineering Information by Categories


Engineering and Science Software


Free Science-Tek Magazines and Publications


Regulatory Offices and Agencies and Standards


Patents  Information


Prototypes Developing Houses, Devices and Tools


IC’s Foundries  and IC Development Services


Certification Labs


Operation Manuals


Physics Units Converter Calculators

Convert any type of unit into any other of any system or scale


Alternative Energies Tutorials:


Ocean Energy

Wind Energy

Solar Energy



Lean Manufacturing Tutorials:

The Seven Causes of Waste

The 5S

The 5 Whys

The 4 M’s +1

Cause Effect / Fish Diagram  

The 4W’s +H+W



Project Charter Example

Value Stream Mapping Introduction and Icons

Current or Present State Map

Future Sate Mapping

Cell Production

Kanban Production System




Electronics and Electromechanical Distributors


Jobs Portal

Easily find your dream Job


Technology News


Science News


Business News


Electronics, RF and Communication Concepts

Rsistors and capacitors colors code

The Logarithm

The bel, decibel , the dbm and the dbmv

Electrical noise definition and Thermal noise

Signal to noise ratio

Physical Constants


Electronic Warfare and Radar Systems Engineering Handbook

Search this site

Para nuestros amigos de habla hispana, los invitamos a visitar el portal tecnológico en español:



If you likes this site, please check like and share above:

To share this site:

To share this page:

If you don’t see the page information, remove the advertising above by clicking on the x on the upper right side of it

The 4 M’s +1 and Cause Effect Diagram



Man, Machine, Materials, Method + Management

The name for 4M’s come from the four initial letters of the words Man, Machine, Materials and Method. However one more has been added here to emphasize the importance of Management in the overall success of failure of a manufacturing unit, whatever this could be just a production line or an entire factory. If Management is not properly involved in the other four M’s and it is sufficiently aware of the process and the possible outcomes, the whole operation and even the problems solution process could yield only mediocre to poor results.


Management is fundamental in establishing the proper policies, leadership, clear guidelines, work discipline, effective solution methods plus the proper work culture. This problem solution method is fundamentally oriented to manufacturing but it can be adapted to be used in any other scenario.


The 4M’s +1 name has to due with the concept that all problems or quality issues are related in one way or other to these five elements.


In a process one or more of these M’s can goes wrong and produce a bad output or product, however many times the root cause can not be evident at glance and a cause effect diagram analysis, involving these elements could be necessary.


The Cause Effect Diagram Integrating The 4M’s +1


This figure represents the possible root causes of a hypothetical defective product in any company, please be aware that the root cause sequence can have many levels beyond the ones shown here in branches A and B

Cause Effect  or Fish Bone Diagram






Lack of Supervision

Unclear Guidelines

Wrong Method

Low Quality Materials

Improper Materials

Lack of Training

Bad Habits

Out of calibration



Incomplete Instructions

Defective Product

Lowest Cost Materials

Lack of Incoming Inspection