Industrial and Systems Engineer | LinkedIn: linkedin.com/in/roberto-salazar-reyna/

Quality control charts represent a great tool for engineers to monitor if a process is under **statistical control**. They help visualize variation, find and correct problems when they occur, predict expected ranges of outcomes and analyze patterns of process variation from special or common causes. Quality control charts are often used in Lean Six Sigma projects and DMAIC projects under the control phase and are considered as one of the seven basic quality tools for process improvement.

The appropriate control chart to use is determined by the type of data (i.e. measurement), the number of defects and the sample size…

Before starting to build any simulation model for a given project, it becomes crucial to identify the types of simulation that best matches the system to be modeled.

Will the system evolve over time?

Will the system agents interact with each other’s and with their environment?

Will agents be capable of adapting to new conditions, thus changing their decision patterns? Is the system to be modeled it a dynamic or complex system?

In this blog, we will review the most popular types of simulation widely used by professionals and academics to conduct simulation studies.

Writing a strong cover letter is not a trivial task. It could either boost your application and make you more interesting for recruiters and hiring managers or disqualify you from the process. People spend a significant amount of time writing and formatting the perfect cover letter hoping it to be read by a talent acquisition professional and, eventually, help them land a job interview. Unfortunately, not all cover letters are actually ever seen by a human eye.

Due to the high number of applicants and resumes with cover letters submissions to job postings, manual resumes screening processes become tedious, ineffective…

The Pareto chart, also known as the **Pareto distribution diagram**, is a vertical bar graph in which values are plotted in decreasing order of relative frequency from left to right. It represents an extremely useful tool during the first stages of analyzing a problem since it helps visualize what problems need attention first by looking at the tallest bars of the chart, which represent the variables with the greatest cumulative effect on a given system.

Developed by the Italian engineer Vilfredo Pareto, the chart provides a graphic representation of the Pareto principle, a theory maintaining that 80% of the output…

Quality control charts represent a great tool for engineers to monitor if a process is under **statistical control**. They help visualize variation, find and correct problems when they occur, predict expected ranges of outcomes and analyze patterns of process variation from special or common causes.

Special causes of variation are detected on control charts by noticing certain types of patterns present on them. In order to truly seize the benefits of control charts, such patterns — and what they represent on a given process — must be recognized to find the reason behind special causes of variation. …

Simulation modeling is the process of replicating an existing (or potential) system into a simulation model using software and technology. Simulation models represent great resources for testing multiple systems hypothetical scenarios in risk-free environments while being able to manipulate their parameters, constraints and logic without having to incur in high costs.

However, even with the use of cutting-edge technologies and software, replicating a system into a simulation model represents a challenging task. …

Reliability is the **probability **that an item, product, machine or equipment will perform a required **function **for a given period of time, under certain operating **conditions**. In other words, it is the probability of a non-failure over time.

Simulation is one of the most widely used operations research and management science techniques. It consists in the use of mathematical methods and computer techniques to **imitate** or **simulate** the operations of various kinds of real-world facilities and process, referred as ** systems**. The assumptions of how a system works usually take the form of mathematical or logical relationships; they constitute a

Since most real-world systems are too complex to allow realistic models to be evaluated analytically, these models must be studied by means of simulation…

Data tress are visual representations of ** hierarchical **data. They are widely used in multiple fields such as decision theory, machine learning, finance, organizational management, routing algorithms, computer science and programming. Data trees help organizing data into groups and subgroups based on a hierarchy.

**Root node**: represents the very top node of the tree. All the existing data points, groups and subgroups end up linked to it. It is the node with the highest hierarchy.**Leaves**: represent children of nodes with higher hierarchies (i.e. parent nodes). They can also be parent nodes of multiple branches of leaves with lower hierarchies.**Attributes**…

An IPO (Input-Process-Output) Diagram is a very high-level diagram used for systems analysis that visually describes business processes with the description of each component in word. It shows a process key inputs and resulting outputs after a set of operations. IPO diagrams are also widely used in software engineering applications.

Represent everything that enters the system to be processed or transformed to achieve the desired outcome. Inputs can be raw materials, information, data or even an outputs from another process.

Represent the set of operations, calculations and steps required to transform the given inputs into the desired outcome. …