How to see that any project is completed in scheduled time or even ahead of schedule without compromising the quality of work?

Time and qunatity and quality analysis are properly managed. 

There are two different parameters to measure here in your question i.e., Quality & Time.

During Planning phase of a Project, We make a Baseline for Project Cost, Time & Quality. On the basis of this baseline, we used to evaluate the performance of completed project work. And to assess the project's performance, we used to do 'Monitoring & Controlling'. WIth the help of periodic monitoring process, we can ascertain the performance of project in time and can take necessary actions as per the requirement.

When we are able to complete the project ahead of its schedules time without compromising the quality, it is indicatior of our expertise, skills improvement and that of team management and understanding of the basic processes to achieve this target. It helps us to further improve the skills and take other complicated projects to testify the skills.

from past data.

by using Forecasting.

and experience

this is the job of project manager who should have enough experience to compare between the real and planned results 

it is his/ her job to find out these details

the tools and software help the project manager and also the fed information to the system that he /she collects from different departments in the company

Any schedule of the project is based on previous experience of time required for any work on any other circumstances which can be studied to the present situation which which will definitely improve the time while not compromising the quality. 

For any type of project to complete within time or as per planning .i am going point wise 

1.Planing

- Planning for completion of project

-Sries wise installation planning 

-Area wise weekly planing 

-follow up with weekly plan if any delay calculate the man power and time and manage extra manpower to achive the work

2.Man power

-highly skiled manpower so that we can minimise the re-work and delay

-Make plann  for manpower to engaged on site 

-Provide bonus or certificate to best worker 

3.Material

One of the most important task is material management on site befor time or time to time 

-Proper storage area

-Identification mark to indentifie the material where material is stored, all document should be loded in computer and make on the paper table  

so we can find the material easily 

-Aproch for vehical movement as per weather condition 

.Planning for tools ,equipment &Acccessaries

-Salection of right tool and thair use 

-Heavy wait vehical planning as per requirment 

Thinking ,Right plannin, finencially strong, follow up of job ,Right joice of skilled manpower 

IF ANY ONE COME WITH THIS IN RIGHT DIRECTION YOU CAN ACHIVE YOUR TARGET AS PER PLAN

Instead of being completed on time, many projects slip, slide, and slither before eventually getting done. Or not. I know an IT department that implemented what it dubbed The Interim System to handle some mandated functionality while a new system was being developed. The new system slipped a month, a year, a … well, actually, it was never completed. The Interim System became the system, but it was known forever after as The Interim System.

Projects stand a reasonable chance of getting done on time (and maybe even under budget) if you’ve taken appropriate steps, such as creating a realistic project plan, delegating work appropriately, using the right tools, tracking progress, and allowing time for things to go haywire, as they so often seem to do.

But are projects ever completed ahead of schedule? It turns out the answer is yes. Do a web search of “projects ahead of schedule” and you’ll see links to many such projects. True, many are construction projects, not software projects, but some software projects do beat the deadline. Interestingly, just as with projects that fall behind, issues can arise with projects or tasks completed ahead of schedule.

For example, what do you do if you finish the project ahead of schedule? Do you conceal the fact or do you alert your manager and customers? After all, your manager might pile on more work. And your customer might wonder if your due date included a healthy dose of padding. Both parties might expect you to finish early again the next time around.

Also, finishing a project or a task ahead of schedule may place a burden on the customer, who can’t keep pace with your expedited completion. An especially busy customer may actually prefer that you slow down the effort to avoid having responsibilities bunch up along the way.

And then there’s the what-do-you-do-next issue. If you complete a milestone ahead of schedule, do you start on the next task in the project? What if you can’t forge ahead until other tasks on the critical path catch up to yours? Do you work on another project, running the risk of having to multi-task when it’s time to get back to the original project? If you have multiple priorities and competing responsibilities, how do you decide where to turn your attention?

Then again, wouldn’t you prefer to wrestle with problems like these instead of having to account for delays, setbacks, and surprises?

Completion of the project ahead of timeThe organization of resources and the application of the system of integration of activities at the same timeWork on continuous follow-up to address any mistakes in timeContinuous accounting amongst project personnel in order to ensure a successful workflow