Objectives: Medical research in longitudinal motor developmental studies brings collection of large data base. Therefore need felt to develop an effective raw data entry method in electronic format using existing software i.e. MS Excel. Methods: 42 infants/children were recruited at the time of birth and were followed up to 36 months of age on Peabody Developmental Motor Scales-2nd edition (PDMS-2) instrument. All 42 subjects had been assessed for 9 times during follow ups at various chronological age points. Total numbers of follow up assessments were 378 i.e. 42 (subjects) __ampersandsigntimes; 9 (no. of follow up). Total number of data entry cell required for each subject in this study was approximately 2611. Thus total data entry cell in this study became i.e. 42* 2611 = 109662. Results: Through this process, each child__ampersandsignlsquo;s raw data digits i.e. __ampersandsigngt;2600 cells, took only 20 to 30 minutes to enter and processed automatically as summary sheet. This process took 21-22 hours for entry of 109662 raw data digits (i.e. 42* 2611 = 109662) in the electronic format. The entered data in the summary sheet had 99% accuracy. Conclusions: This method is very useful for any number of raw data entries in electronic format in a short span of time for the research works of any type. It is easy and unique, because, it uses very simple concept of formula applications to bring the data entries in a summary sheet, while typing the data in a different sheet of the same MS Excel file, for the ease of typing and data errors verification. This method is cost effective also, since the application software MS Excel is easily accessible.