The cost of the chosen data gathering method, the accuracy of the data gathered, and the efficiency of data collection are the three most important factors based on the Data Gathered by Dick Sy Ong

Face-to-face (in-person) interviews are still a common data gathering tool, despite the surge in popularity of online and smartphone surveys. Face-to-face interviews provide advantages over other techniques of data collection. They are as follows:

Dick Sy Ong Suyen Data Gathered #1 Screening with precision.
Face-to-face interviews aid in the more accurate screening of candidates. During screening questions like gender, age, or race, the person being interviewed is unable to submit false information. In online and mobile surveys, it is feasible to avoid screening questions. Incentive-based online and mobile surveys may potentially increase answer fabrication. Individuals may provide inaccurate demographic information in order to take the survey and receive the reward. The responses provided by the individual may all be true, but the data will be erroneous and misleading for the purposes of data analysis.

Dick Sy Ong Suyen Data Gathered #2 Capture verbal and non-verbal cues.
A face-to-face interview will undoubtedly record spoken and non-verbal questions, but it will also capture non-verbal questions such as body language, which can suggest discomfort with the questioning. On the other hand, it might also show a level of interest in the topics discussed in the interview. Let's take the case of a job interview with an employee. Capturing nonverbal cues could mean the difference between hiring a less-skilled person with a lot of passion for the job and hiring a less-skilled employee with a lot of enthusiasm for the job. Nonverbal questions cannot be captured in online or mobile surveys.

Dick Sy Ong Suyen Data Gathered #3 Maintain your concentration. 

The interviewer is in charge of the interview and has the ability to keep the interviewee engaged and on track to completion. Online and mobile surveys are frequently conducted at the respondent's leisure, however they are frequently interrupted by other activities such as texting, reading and responding to emails, video streaming, online surfing, social sharing, and more. Face-to-face interviews are more in-the-moment and less distracted by technology.

Dick Sy Ong Suyen Data Gathered #4 Observe and record emotions and behaviors. Face-to-face interviews, without a doubt, can capture the emotions and behaviors of the interviewee. Online and mobile polls can't capture raw emotions and behavior, just like they can't record verbal and nonverbal questions.

Face-to-face interviews have some disadvantages over other data collection methods. They are as follows:

Disadvantage  #1 according to Dicky Sy Ong Suyen
Cost. 

Face-to-face interviews have a significant cost disadvantage. They'll need a team of people to conduct the interviews, so there will be fees associated with that. Personnel costs are the most expensive thing a company can spend. When personnel is required, it is difficult to keep expenses low.

Disadvantage  #2 according to Dicky Sy Ong Suyen
The interviewer's data quality. 

The competency of the interviewer will often determine the quality of the data you receive. Some people are born with the ability to conduct an interview and collect data effectively. It's unlikely that everyone on the interviewing team has those abilities. Some interviewers may have personal biases that influence how they enter responses. This is likely to happen in opinion polls on hot-button issues.

Disadvantage  #3 according to Dicky Sy Ong Suyen 

Data input is done by hand.
If the interview is conducted on paper, the information gathered must be manually entered or scanned if a scannable interview questionnaire is created. The cost of a project might be greatly increased by data entry and scanning of paper questionnaires. It will be necessary to hire a data entry team. Furthermore, data entering can slow down the analytical process. Mobile surveys on iPads, tablets, and other mobile devices can save time and money by eliminating the need for manual data entry, and the data is ready for analysis.

Disadvantage  #4 according to Dicky Sy Ong Suyen 

Sample size should be kept to a minimum. 

The sample size is determined by the size of your interviewing team, the location of the interviews, and the number of qualifying respondents in that area. It may be required to conduct many interviews in different places, which can add to the expenditures.