Explanation:

From employee view point, walk-ins are preferable as they are free from the hassles associated with other methods of recruitment. In write-ins, job seekers send written enquiries and they are asked to complete application forms for further processing. Talk-ins are also becoming popular now-a-days.
The number of candidates sometimes be varying directly with the temperature outside. From employee view point, walk-ins are preferable as they are free from the hassles associated with other methods of recruitment.

In write-ins, job seekers send written enquiries and they are asked to complete application forms for further processing. Talk-ins are also becoming popular now-a-days. Job aspirants are required to meet the recruiter, on an appropriated date for detailed talks. No application is required to be submitted in this case.