Book Description
Micro process engineering is approaching both academia and industry. With the provision of micro devices and systems by commercial suppliers, one main barrier for using these units has been eliminated. More and more they become familiar, thereby being one facet of the upheaval in chemical industry.

This book focuses on processes rather than on devices: what is 'before' and 'behind' micro device fabrication. A comprehensive and detailed overview is given on:

• A multi-faceted, hierarchic analysis of chemical micro process technology
• Modelling and simulation of micro reactors
• Liquid- and liquid/liquid-phase reactions
• Gas/liquid reactions
• Gas-phase reactions (heterogeneous catalysis)

Book Description
This is a review manual to assist students preparing for the PE exam in all 50 states.This review book includes 146 example problems with detailed step-by-step solutions.This book covers all topics on the exam.The introductory chapter reviews the test specifications and the author's recommendation on the best strategy for passing the exam. The first chapter reviews English and SI units and conversions.A complete conversion table is given.Chapter 3 covers heat transfer, conduction, transfer coefficients and heat transfer equipment. Chapter 4 covers evaporation principles, calculations and example problems.Distillation is thoroughly covered in chapter 5.The subsequent chapters review fundamentals of fluid mechanics, hydraulics and typical pump and piping problems: absorption, leaching, liquid-liquid extraction, and the rest of the exam topics.Each of the topics is reviewed followed by examples of examination problems.This book is the ideal study guide bringing all elements of professional problem solving together in one BIG BOOK.The first truly practical, no-nonsense review for the difficult PE exam. ... Read more

Customer Reviews (6)

A Book for Chemical Engineers by Chemical Engineers
I took Chemical Engineering PE exam in April 2007 for the first time. I passed the exam. When I was solving the problems in the actual exam I knew what I was doing. I was confident that I will pass. The main reason was Chemical Engineering License Review.

License review is written by chemical engineers. This book brushed up my chemical engineering knowledge. Review has addressed all areas in PE exam. But the best covered area is Chemical Reaction Engineering. There are lot of questions on reaction engineering (11%). Problem with kinetics is that we do not use it everyday like fluid dynamics or heat transfer. This book will bring you up to the speed for kinetics problems. Kinetics is the area which will make it or break it.

Review was great help in plant design and operation section. I found this section very useful during actual examination.

Heat transfer chapter has good review of shell and tube exchangers. Fluid dynamics chapter helped me in flow of fluids in pipes and pump calcs most.

License review gives extensive coverage for mass transfer. Absorption and distillation are very important sections and this book prepared me well to solve those questions.

Book had printing mistakes but these mistakes did not deter me from understanding the principles. There are other reference books/solved problems (Chemical Engineering Reference Manual, NCEES problems) available and they are useful too. While studying I kept this book as a main focus and used other reference material also. Study from more than one source is a must. If one starts early enough and balance fundamentals and problem solving properly then passing in the first attempt is not tough.

PE exam tests experience and fundamentals. License Review will clear your fundamentals. It helped me during exam and I am going to keep it as a reference also.

I did not have resort to option elimination. In most of the cases I got the answer and it matched with one of the option. Now I can say my answers were correct (atleast most of them!!!) because I passed the exam.

Do not use this book as a reference for the ChE PE Exam
This book is a completely useless resource for the Chemical Engineering PE Exam.The format and layout of the book is clumsy and poorly structured.The errors in the text are frequent and in my judgement, completely unacceptable considering that the nature of the subject matter is a review for a professional engineer, which implies high standards and an even higher level of performance.The associated sample exam text proves to be more of a hindrance than a help because it leaves the reader with an inadequate amount of information to solve the sample problems and an even more inadequate reference for solutions to the problems.To date, the most effective use of this text that I have been able to devise is its use as kindling for my fireplace.The was, by far, the biggest waste of money that I have ever suffered.

Not a bad review book
There is no book yet published that is particularly good for the ChE PE, but this one doesn't deserve such poor reviews. It is far more coherent than the most popular review book (by Professional Publications), althoughit doesn't have reference tables or graphs that might be commonly needed.It is more like a distillation ofChE textbooks.

The cover says it all....
I am not making this up.One of the features listed in bullet form on the cover is:

* Written by two achomplished Professional Chemical Engineers

I implore you not to buy this book.

The paperback stinks too!
Don't be fooled by the updated cover.The paperback version does not fix any of the serious flaws contained in the hardcover version.Don't waste your money. ... Read more

Book Description
Bottom line: For a holistic view of chemical engineering design, this book provides as much, if not more, than any other book available on the topic. Extract from Chemical Engineering Resources review.

Chemical Engineering Design is a complete course text for students of chemical engineering. Written for the Senior Design Course, and also suitable for introduction to chemical engineering courses, it covers the basics of unit operations and the latest aspects of process design, equipment selection, plant and operating economics, safety and loss prevention. It is a textbook that students will want to keep through their undergraduate education and on into their professional lives.

* Provides students with a text of unmatched relevance for the Senior Design Course and Introductory Chemical Engineering Courses
* Teaches commercial engineering tools for simulation and costing
* Comprehensive coverage of unit operations, design and economics
Strong emphasis on HS&E issues, codes and standards, including API, ASME and ISA design codes and ANSI standards
* 108 realistic commercial design projects from diverse industries
* A rigorous pedagogy assists learning, with detailed worked examples, end of chapter exercises, plus supporting data and Excel spreadsheet calculations plus over 150 Patent References, for downloading from the companion website
* Extensive instructor resources: 1170 lecture slides on CD plus fully worked solutions manual ... Read more

Book Description
As technological systems become more complex, it becomes increasingly difficult to identify safety hazards and to control their impact. Engineers today are finding that safety and risk touch upon every aspect of any engineered process, from system design all the way through disposal. Employing highly pragmatic examples from a number of industries, System Safety Engineering and Risk Assessment: A Practical Approach provides a comprehensive and easily accessible guide on how to build safety into products as well as into industrial processes. Using a systems approach, the text discusses the best system safety techniques used in various industries, types of hazard analyses, safety checklists and other safety tools, as well as techniques for investigating accidents. It explains how to set up a data management system for a system safety program, and delves into risk assessment, including ways to conduct a risk evaluation. While the book provides engineers with an efficient reference in a critical area, the clarity of the writing along with the case studies and illustrations makes this book accessible to non-technical professionals needing a how to guideforthe safety management of complex systems. It is also used by graduate classes involved with ergonomics and occupational safety as well as engineering. ... Read more

Customer Reviews (3)

A great textbook
System Safety Engineering And Risk Assessment is an excellent reference on how to engineer safety and manage risk. The clarity of the writing combined with understandable examples makes this book an outstanding text for a course on engineering safe systems.

This book starts by introducing the need and benefits of implementing a system safety program providing context for the later material.Key safety concepts and definitions are then introduced with references to relevant government and industry standards. A pragmatic discussion follows on the necessity of management and organizational support for an effective safety program. The book then details specific techniques for hazard identification and analysis including HAZOP, fault tree, FMEA, FMECA and a few lesser known methodologies. The overview of human factors analysis begins with the observation that "human error is an out-of-tolerance action within the human machine system."This discussion provides a comprehensive framework for the more advanced material referenced in the section. The only weakness was the following section on software safety, which lacked detailed descriptions of state-of-practice analysis techniques. The analysis section is strengthened by the discussion of accident and failure reporting systems and the associated databases that are used to support accident and reliability analyses. The final chapters of the book provide a practical discussion of how to manage risk using tailored versions the various techniques introduced in the previous sections.

All in all, this is a worthwhile reference for systems engineers and safety officials.

Illuminating Systems Safety Overview
In this book, Nicholas Bahr has taken the complex discipline of systems safety and made it accessible in a logical, useful format. The book is clear and well illustrated (although a couple of the charts are a bit cumbersome and unwieldy), and calls upon numerous case studies to illustrate key points. There are separate chapters of Hazard Analysis, Fault Tree Analysis, Safety Analysis in Engineering, and Safety Management.

While useful for engineers (particularly in the chemical processing or nuclear fields), this book is written in comprehensible terms that do not require an engineering background or technical education to understand. In fact, I believe that the biggest beneficiaries of this book are not engineers at all, but non-technical managers, who desperately need to understand safety systems, but often don't. In fact the chapter on Safety Management should be required reading for any manager in a safety critical environment, as it is an excellent "how to" guide to safety management of complex systems. This chapter has examples of correct safety management, and more importantly, excellent examples of the perils of management unwillingness to prioritize safety. The case study of the Nypro UK cyclohexane plant explosion in Flixborough, England is the best detailed, and has universal applications to safety systems across varying industries. The loss of the shuttle 'Challenger' is also reviewed from a systems safety vantage point, but while there are many errors to be analyzed and learned from there, more of the lessons are industry specific than are the lessons from the Flixborough example.

I used this book in a graduate class on systems safety. This is one of the best safety books I have seen, and is the most concise text on systems safety that I have ever read, far better, for instance, than the works of Perrow. Mr. Bahr is to be commended for his work; I look forward to reading more by him in the future.

A good book for the student and the experienced professional
I used this book to teach system safety engineering to graduate students.The author provides the reader a background into system safety that lays the ground work for a functional and proactive system safety process.Thisbook provided workable examples to the student for comprehension of thematerial.Students as well as the instructor had a better understanding ofsystem safety and the integrationof the processes into general industrialand avaition safety programs/processes. I wish I had this book when I wastrying to explain to my management what system safety engineering was andhow it benefits the engineering department. ... Read more

Book Description
This new edition follows the original format, which combines a detailed case study - the production of phthalic anhydride - with practical advice and comprehensive background information. Guiding the reader through all major aspects of a chemical engineering design, the text includes both the initial technical and economic feasibility study as well as the detailed design stages. Each aspect of the design is illustrated with material from an award-winning student design project. The book embodies the "learning by doing" approach to design. The student is directed to appropriate information sources and is encouraged to make decisions at each stage of the design process rather than simply following a design method. Thoroughly revised, updated, and expanded, the accompanying text includes developments in important areas and many new references. ... Read more

Customer Reviews (1)

good informative
good insight for relevantindustry and acemedician ... Read more

Customer Reviews (2)

helpful, worthwhile... but much harder than the test will be
I just took the PE exam (earlier today) and I used the six-minute solutions in my study prep.I have some pro's and cons.
Pros:
1.It covers the most of topics you will find on the exam.
2.The solutions work through the problems thoroughly and also explain why the incorrect answers are incorrect.
3.The problems are formatted like the test: multiply choice, one scenario per question.some of the other sample test will describe a scenario and then ask several questions that build on one another.
4.If you can blow through these problems you will not have any issues the the real thing.

Cons:
1.Errors.The are at least 12 errors in the scenarios and the solutions.Make sure you download the errata off the ppi website before you start or you be pulling your hair out.
2.The problems are much more difficult than what you see in the exam.Some of the solutions take 2+ pages (4 columns) of type written calculations!Six-minutes my arse.Don't be surprised if you send 45-60 minutes on a problem.They have problems that include several iterations and large amounts of calculations.There is even one extraction problem that they construct a to-scale graphical solution to determine number of stages.You will NOT see this on the test.


Bottom line:I recommend getting this as a part of your study materials.I was able work through all of the problems eventually, but don't let the difficulty of the problems get you down.The real test is not involved.Get the NCEES practice exam and use it as your timed trial test.

I definately recommend the Michael Lindeburg series of books especially the Reference Manual.

Excellent practice tool for PE exam
This little book is bigger than what meets the eye.Excersices are practical and explanations are very detailed.Anyone involved in Chemical Engineering practice should have one, at least to practice a few exercises to keep your engineering knowledge sharp.Consider it a chemical engineer "quick mental fitness manual". ... Read more

Book Description
This text explains the concepts behind process design. It uses a case study approach, guiding readers through realistic design problems, and referring back to these cases at the end of each chapter. Throughout, the author uses shortcut techniques that allow engineers to obtain the whole focus for a design in a very short period (generally less than two days). ... Read more

Customer Reviews (1)

Conceptual Design Review
The book is quite interesting and based on real life examples on the sinthesys of chemical processes. An economic approach to the optimal design is presented subdivied in five distinct steps. The HDA process is analyzedin detail showing how to select the optimal economic layout of the plant. ... Read more

Customer Reviews (2)

ProblemSoving in Chemical Engineering With Numerical Methods
problems have been carefully selected to illustrated the use Polymath to solve chemical engineering problems and will be of grat use to me in teaching Che. Eng. courses for quick calculations,above all difficult modelled systems with linear and non linear algebraic and differebtial equations.

Practical Information!
This textbook places practical chemical engineering examples and numerical techniques at the fingertips of undergraduate students!This book is appropriate for publication and has a high market potential in chemical engineering.

This book contains many chemical engineering problems that are of interest to both practicing and aspiring chemical engineers.There are excellent examples using experimental data and analytical solutions. This text is clearly written for the reader who wants to quickly utilize the proposed numerical method to solve his or her own problems.The text contains many examples of practical chemical engineering problems.As a professor, I was fascinated with the number and types of problems that POLYMATH can be used to solve.I have used the differential equation solver and non-linear regression features of POLYMATH for many years, and am pleased to see that I can expand my use of POLYMATH to many other types of problems!

I use this book for a series of chemical engineering courses starting in the sophomore year.I envision that it could be used by others in at least two formats.This text could be required of all chemical engineers and be used starting in the freshman year with regressions and progressing up through algebraic and linear equations in the sophomore years and finally using ODE solvers in the Junior and Senior years.This procedure would result in all chemical engineering departments that use POLYMATH, requiring their students to purchase this textbook.

The second approach that could be used is to use this book in a separate numerical methods course for chemical engineers.Many chemical engineers have a required course in numerical methods that this book could be used as a source book for many problems.

Chemical engineers are primarily concerned with obtaining solutions to problems.Chemical engineers do not typically write their own programs to solve problems.Instead they are using software packages.POLYMATH is an excellent package for students because the user must understand the mathematics of the basic phenomena and create a model.The method or technique used to solve these equations is not the major concern of the chemical engineer.

This book will place at the fingertips of undergraduate students a myriad of numerical techniques for solving problems.This book does not require that the student have completed differential equations course, since the solutions are clearly presented and sample programs are provided in the software libraries.This approach gives students tools at an early stage in their career and they can learn more about these tools in a later numerical methods course.

This book is an excellent compendium of chemical engineering problems that require numerical methods to obtain a solution.The book starts with simple examples in chapter 1 that show many of the excellent features of POLYMATH.Chapter 2 covers regressions, Chapter 3 is advanced techniques such as successive substitution, stiff ODE's, ill conditioned ODE's, secant & false position methods, 2nd order ordinary differential equations and using a shooting method for its solution.Chapters 4 and 5 give specific examples of numerical techniques in thermodynamics fluid mechanics, respectively. ... Read more

Book Description
This is the Second Edition of the standard text on chemical reaction engineering, beginning with basic definitions and fundamental principles and continuing all the way to practical applications, emphasizing real-world aspects of industrial practice. The two main sections cover applied or engineering kinetics, reactor analysis and design. Includes updated coverage of computer modeling methods and many new worked examples. Most of the examples use real kinetic data from processes of industrial importance. ... Read more

Customer Reviews (6)

Sophisticated Book
Don't be mistaken. This is still THE BOOK when it comes to modeling the complexities of real world problems in reactor design. It is certainly not the best text to start learning chemical reaction engineering from (check out Fogler, Schmidt or Levenspiel instead). The mathematical level is quite high, development of concepts is terse. These guys don't give you any introduction to simulation programs - they simply expect that you're able to handle an ODE solver or write your own piece of code. An active reader is required. Not a text for the typical undergraduate, but for someone who has already been exposed to the fundamentals.
Of course, this book does have its flaws (which doesn't?). It lacks, for example, a comprehensive and rigorous treatment of stoichiometry (look into Aris' books on reactor design for that stuff). Polymer reaction engineering is not dealt with in a systematic way while biochemical reactions play no role at all. But at the end of the day this book simply stands in a class of its own with no serious competition in sight (the chapter on fixed bed reactors is outstanding). In my mind, it is the reaction engineering equivalent to the famous "Transport Phenomena" by Bird, Stewart and Lightfoot. Highly recommended. An updatedthird edition would be desirable.

Keep looking
This book isn't very good. Lets face it, it is almost 20 years old. Way out of touch with today's computer programs. The references are ancient. I would consider this book only as an alternative to more modern text books.

A beautiful mess
While this book does have it's good points You need a reference book to get anything of use from it. My professor disliked it so much that weswitched text. And occasionally did problems from Froment so he couldjustify assigning the text for graduate kinetics.

The best and most advanced book on reaction engineering
This book is very comprehensive and advanced level.It is the only book you will ever need on reaction engineering.It thoroughly explains chemical kinetics and steady-state and transient reactor operation. Itsuited both for undergraduate and graduate students, although the graduatestudent will grasp the subtleties of reactor modeling better. It isextensively referenced with relevant scientific literature and containsample current research on the topic. In comparison, Fogler's book will notserve you beyond your initial reaction engineering course and servesstrictly undergraduate food.

Excellent reference book, good textbook for graduate course
This book presents an excellent amount of highquality information, it is the best reference book I have found for chemical reactor analysis and design. Using it as a textbook in Master or Ph.D. level courses must beaccompanied by good lectures, I used it when I took the graduate course in1995, our professor did very good lectures, and that was more than enoughto learn a lot and enjoy the topic.When comparing this book with Fogler'swe have to step down to another level of analysis, Fogler's book is theequivalent book for undergraduate level courses, it is a good reference forbasis and step by step learning, and for understanding the numbercrunching. ... Read more

Book Description
”Chemistry in the hands of Engineers!” This mantra, initiated and developed largely in the research programs of academic chemical engineers over the last few decades, has now made its way into the core undergraduate curriculum in the form of a new Chemical Reaction Engineering textbook by Cal Tech’s Mark E. Davis and U VA’s Robert J. Davis…”-Michael T. Klein, Rutgers University

This book is an introduction to the quantitative treatment of chemical reaction engineering. It is appropriate for a one-semester undergraduate (or first-year graduate)course. The text provides a balanced approach: first, it covers both homogeneous and heterogeneous reacting systems; second, it covers both chemical reaction engineering and chemical reactor engineering.

Here's what reviewers have to say:

“The Davis/Davis book really brings out the strong coupling between chemical reactions and reactor design concepts in a pedagogical fashion.”-Michael S. Wong, Rice University

“Great use of chemical reactions as teaching examples” -Michael S. Wong, Rice University

“The examples, illustrations, and vignettes given in the text are very well done, and are of either fundamental or practical interest.”-David F. Cox, Virginia Tech

“A primary motivation to use this text is the arrangement of the introductory material on kinetics.The initial description of reactions and kinetics in Davis/Davis appears prior to the introduction of reactor material balances.” -David F. Cox, Virginia Tech

“Concise development and discussion of material”-Michael S. Wong, Rice University ... Read more

Customer Reviews (1)

Chemical Reactions Engineering Textbook
This book was deeply discounted so I knew it was not in good condition, but the description did not state that the binding was slit open.Other than that, everything was ok and the book came by the date advertised. ... Read more

Customer Reviews (3)

Great book for a rookie chemical engineers!!!
It's a very helpful book for getting a real and useful information about the common tasks and activities in the engineering design

Analysis, Synthesis, and Design of Chemical Processes, Second Edition
Item received as described. Took much longer than expected. Seller didn't notify me that there would be a two week delay until I contacted them and waited several days for a response.

Great ChemE Book
I really like how they focused on Hysys which is what is mostly used in industry. This is a great book for undergrads and grad taking designs in chemical engineering. ... Read more

Book Description
This book provides an introduction to chemical engineering analysis- which reviews the processes and designs used to manufacture, use, and dispose of chemical products-and to Mathematica, one of the most powerful mathematical software tools available for symbolic, numerical, and graphical computing. Analysis and computation are explained simultaneously. The book covers the core concepts of chemical engineering, ranging from the conservation of mass to chemical kinetics. At the same time the text shows how to use the latest version of Mathematica, from the basics of writing a few lines of code through developing entire analysis programs. ... Read more

Customer Reviews (6)

Fluid Mechanics for Chemical Engineers
This is a simple basic book about fluidics. Not complex equations.
Not a heavy mathematics. Contain useful information about technology process with fluids - bubbles and two phase flow.
Published in 1998 has relatively old information about everything.
Positive side - has a small chapter (20 pages) about
MatLab PDE Toolbox for solving fluid mechanics problems.
No connections with COMSOL at all or any kind of simulation.

Wilkes
This is the worst text book I have ever used. I used it for an independent study class and my professor agreed that the topics were not rigorously explained. In addition, frequent assumptions were made without explination and referals were made to "lecture notes," which is, of course, useless if you aren't taking this man's lecture.

compatible with any classroom text
I think that this book is an indispensable guide for fluid mechanics. It is easy to understand and it lets you progress with your pace with its solved examples. And one can excel in fluid mechanics by solving the suggesred problems of the book. This book not only helps you to understand the concept mathematically but gives the physical meanings of the problems.

This book is concise,clear and easy to understand.
I have a good chance to study this course with Prof. Wilkes at Petroleum and petrochemical college, Chulalonkorn University in Thailand. This book is very useful for me because it's easy to understand and clear in everystep.For example,some part of the fluid mechanics, I think it's verydifficult for me to understand in the past(in bachelor's degree) but when Istudy this book, it make me clear and easy.I think this book is suitablefor the beginner thanthe others that I met before.

A definitive fluid mechanics book for Chemical Engineers
Here is a book that is concise, comprehensive and to the point. The authours are meticulous with the math and present a wide variety of chemical engineering applications of fluid mechanics. The book issurprisingly easy to follow and is highly recommended for any systematicstudy of the subject. The language is clear and succinct and the layout ispleasing. ... Read more

Product Description
This book deals with basic principles such as chemical equilibrium and chemical processes, concepts which make up the basic tools necessary to design a more efficient system to solve environmental problems.Useful as a textbook for both graduate and undergraduate, the material also serves as an excellent source for professional research in the field of environmental engineering or environmental science. ... Read more

Customer Reviews (2)

Excellent presentation of optimization algorithmics
The first chapters deal with economics, really elementary material.However, it is a worthwhile discussion of plant sizing and costing.I liked the later chapters on optimization: HENS, MINLP, scheduling, flexibility in processes, etc.Traditional books on optimization will not help you here because they will not show you how to set up your optimization problem. Systematic Methods does this!The book also contains some discussion of liquid-liquid separations.

As far as content is concerned, the book deserves a 5, but there are problems which reflect its first edition status.The index needs reworking (where is the entry for Fenske's equation?), and there are numerous typographic errors which mar the appearance of the presentation.

The book is not example intensive.The reader is expected to think, and to follow the given example requires paper and pencil, not just casual glances.What should be appreciated is that this book is written by the leaders of the field, and the material is absent in other texts.Much of the text reflects research conducted by the authors.

systematic methods ofchemical process design
systematic methods of chemical process design. optimal design of multipurpose chemical plants. downstream process economics in seperation process in biotechnology. ... Read more

Book Description
Contains added chapters emphasizing the importance of choosing the correct project and defining project goals. Stresses the need for adequate front end loading (FEL) and outlines the responsibility of the venture manager in project selection. Provides updated case studies and examples on technical evaluation criteria, construction progress monitoring, offshore estimating, and more. The authors discuss such topics as initial involvement and plan of action, process design, regulatory compliance, risk analysis, project execution plan/master project schedule, estimating, contracting, detailed engineering, procurement, construction management, project control, contracts administration, communications, and plant start-up. ... Read more

Customer Reviews (1)

Project Execution Methodology -- Foundation Builder
I am about 50% through the book, and it has provided me with a good baseline approach to small & large projects. I have worked in process engineering, manufacturing, and process automation/control, but I havenever professionally executed a chemical construction project. The book haseverything you need to formalize a project execution methodology, includingestimating rules-of-thumb and expected outcomes of each phase in theproject. The only problem that I've seen is the author's repeated incorrectusage of the word "insure" -- in most cases, Pablo should haveused "ensure". OK, so I'm picky.. ... Read more

Customer Reviews (3)

Good book for beginners!
If you are a student of chemical engineering and you need to study process control, this is the best book to initiate. After you can look for more specialazed books. It's excellent for general view.

A clear, concise, authoritative book on this subject.
This is a no-nonsense, straight-to-the-point book, which effectively covers the topic of chemical process control. Though it is quite old now, much of the information is still very relevant and useful.

The way of simplifying explanations and writing from anunderstanding point of view (rather than merely presenting facts) is great and I wish all books were written in such a way!

contol
Certainement le meilleur ouvrage dans le domaine de la régulation industrielle appliquée àl'industrie chimique. ... Read more

Book Description
The authors of this text aim to educate the reader on nuclear power and its future potential. It focuses on nuclear accidents such as Chernobyl and Three Mile Island, and their consequences, with the understanding that there are safety lessons to be learned if nuclear power generation is going to be expanded to meet our growing energy needs. ... Read more