Why Project Documentation Required 
. See following article for further detail.
It's important not to neglect requirements when it comes to project documentation. Since documentation give advantages to your project's success. You need to know how much documentation a given project needs to get it right the first time. It’s necessary to provide documentation to developer and designer team from both Project manager and development managers.
Most of the time documentation contain following things
1) software applications
2) network solutions
3) Enhancements of existing legacy applications.
Documentation Provide much more feasibility in a project for top level, middle level and lower level manager. In IT (Information Tech.) Projects each project is unique and therefore required unique documentation. The trick is to remember to add the appropriate documents once you have defined the methodology. (i.e., SDLC Etc.) You are going to use and after that decide which documentation is really helpful to you for developing project. Basically Documentation is always remaining same but project business logic, Financial Model, Technology use etc is change. Architects, developers, DBAs, and engineers are a part of project documentation. A common managerial Fund is, “We can’t proceed with the project until this document has been completed and approved by management.”
Let’s explore some of the reasons behind creating documentation for your project
Advantages
1) Make Easier team development
2) Clarifies issues the project team may have
3) Identifies what are a project and its loopholes.
4) Prevents delays and rework
5) Allows for standardization of projects
6) Provides traceability of what was said
Disadvantages
1) Can be considered too administrative
2) Slows down the entire process
3) Decline in standards
4) Causes a rise in project cost due to delays
5) Poor quality
6) Considered by developers as non-value-adding
Both project and development managers need to realize that which type of documentation is required for which types of project. We can Classify Projects in following three types.
1) Small projects
2) Medium-size projects
3) Super-size Or Large Size projects
Small projects
These projects Duration range will be one to four months. Management has a responsibility to speed and completing the project as quickly as possible
Medium-size projects
These projects Duration range will be one to 12 months. These types of projects are not that quick to resolve, and they usually involve external vendors and integration. The level of risk and change control increases in this a type of projects.
Super-size projects
This Projects Are large in a size. They may take a few years to complete.
Project documentation focuses on following guiding for project team and readers
1) Define the aim and background of the project.
2) Identify Tasks deliverables and dates.
3) Document the technical parameters and technologies to be used.
4) Assess items such as quality, scope, resources, risk, training, and cost.
5) Document any back-out or contingencies that could occur.
Proper documentation is necessary for your project’s success. Project documentation is a form of many types such as source code, hardcopy documents, or transmitted in electronic form, you need to plan for developing project documentation before starting the project. Managers should act in advanced the time required for developing such project documents and update them whenever a change occurs in a project.
Best of luck for your project documentation 
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