The assessee was initially following the Percentage completion method by showing income on the basis of percentage of work done. In contrast, the project completion method, which is an equally recognized method, mandates the determination of income at the time of completion of project. Both the methods are recognized methods. Whereas, in the first method, profit is considered on year to year basis parallel with the progress of construction, in the latter, profit is considered when the project is completed. Under both the methods, the amount of income remains unchanged except for the effect that the profit shifts from one year to another. The assessee switched over from the Percentage completion method to the Project completion method by filing a revised return. Once it is seen that the assessee switched over from the Percentage completion method to the Project completion method in a bona fide manner and continued with the changed method in the years to come, it is allowed.