In n-tier architecture the entire application is divided in several pieces. These pieces can be logical or physical. Each piece performs a specific task such as displaying user interface or data access. There can be any number of tiers or layers of such pieces. Hence, the name n-tier (Note that many times the terms tier and layer are used interchangeably). However, most commonly applications have 3 distinct tiers or layers. They are:

• Presentation Layer
• Business Logic Layer
• Data Access Layer

As you can guess, presentation layer is nothing but a piece of software that deals with user interface of your application. Displaying data to the end user and allow them to interface with it is the core functionality of this layer.

In most of the cases the data entered by the end user needs some kind of validation or further processing. This is the responsibility of Business Logic Layer.

Finally, your application data needs to be stored and retrieved in some data store (RDBMS, XML etc.). This task is handled by Data Access Layer.

In short, the process works like this:

• User requests for some application data.
• The data access layer retrieves the data and is forwarded to the presentation layer via business logic layer. Sometimes data access layer gives this data directly to presentation layer.
• Presentation layer receives the data to be displayed via business logic layer.
• The user changes the data and initiates the appropriate action (such as insert, or update).
• The business logic layer validates the data submitted by the user.
• If the data is valid it is handed over to data access layer for updating into the database.

Advantages of N-Tier ArchitectureAt first glance this division of tasks may seem to be unnecessary. However, it gives following benefits:

• The applications gets divided in logically isolated pieces reducing tight coupling between the UI, business processes and database.
• Change in the underlying database and data access methods do not have any effect on the presentation layer or client application.
• Client application no longer has SQL statements embedded in it. This makes it de-coupled from rest of the application.
• Table and column names can be effectively eliminated from the client-side code.
• The client application is unaware from where data comes (location transparency).
• It becomes easier to modify or extend your application, without breaking or recompiling the client-side code.

The downside of n-tier architecture is that you need to create many isolated classes and pieces of software. However, benefits of n-tier applications will far outweigh its disadvantage.

Here's what the resume advice company Resume Edge recommends as a sample answer to the question, "Where do you see yourself in ten years?"

In ten years, I endeavor to have refined my strategic and client relations skills. I intend to be a leading expert in estate planning. After having proven myself as a senior manager, I hope to help shape the strategic direction of estate planning services. I could do this in any number of official roles. The important thing is that I will continue contributing my abilities in a challenging and rewarding environment.

More advice

• While it is not usually a good idea to try to be a Jim Carey in an interview, depending on how things have gone and who you are dealing with, you might inject a little humour here and ask: "When do you expect to be promoted?" ....or "When are you moving on?... This could easily break the ice. Seriously, you can easily respond that you have no idea as you have no idea what you are capable of so far, although you know it is a lot. Therefore, you want to make sure you are open and flexible to whatever opportunites present themselves. If you actually know what you want to be when you grow up, you could offer to conduct a seminar on how to actuate that.

• You know when you come to that common situation where someone asks you "Where do you see yourself in five years?" Yea you should call a person on that because that question is silly! You have no idea where you'll be in five years nor should you worry. I mean how depressing can that question actually be? If someone asked me that question five years ago I wouldn't have predicted my life to be like this nor would I have wanted to say my life would be like this, I'm not saying I'm unhappy with my life necessarily its just that in a span of five years a persons likes and dislikes change, the people around them either disappear, reappear, or show up for the first time. The things you once loved could become something you hate or vice versa. Aspirations change and feelings lose their magic. Yes you can say what you'd like to see happen in five years but I'm pretty sure it won't and five years from now when you look back on yourself answering that question you'll probably no longer want the same things. There's always hope but no definite so all you can do is live life like you have those five years to look back on...

• When an interviewer asks this question, they're asking where you see yourself within a company. They don't want to hear you say, "Well, in five years, I will be married to a handsome European man, touring the South Pacific in our yacht with a maitai in my hand." They want something like, "Well, that will depend on my individual performance and on the opportunities I'm presented with, but ideally, I will be..." Even if you're going, "Yeah, like I'll be here in 5 years..." act like you will be. They don't want to hear you saying you'll essentially use them to get where you want, and the minute the opportunity is presented jump ship.
• Some might think that you should not tell the interviewer that you want to move up the ladder of success, because they will fear that you might replace them or move on to another job. However, most would recommend that you answer with just the opposite: that you do want to be successful. A good manager wants his employees to be successful and grow in their careers because that benefits the whole company. If they don't want this, you don't want to work for them. As for the actual standards of success and specific career paths, they are very different for different people and different industries. It is most important to show that you do want to be successful.
• Think educationally-- higher degree? certification? Think leadership-- at least one step up from where you are at now.

Where will you be in five years?

This is a very common job interview question. Think carefully about your plans. Really answer it for yourself, Where do you see yourself in five years? Where do you hope to be?

The interviewer is looking to find out a few things with this question. First, are you the type of person who plans ahead and sets goals? You should be. Second, do your goals match those of the company and the position? Your goals need to fit the career path for the job. They don't want to lose you in a year or two.

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