Advantages

Disadvantages

Increased sample heterogeneity so better generalizability of results 

Access to internet users only

Economical e.g, no photocopying questionnaires; travelling to test respondents from different geographical areas; specialised equipment etc

Technical issues e.g., varying network connections, internet server slow/down > loss of data

Voluntary motivational nature of participation may reduce factors such as careless or deliberately fictitious responding & drop-out

 Higher drop-out rate in internet studies

On-line studies run around the clock

Possible multiple submissions of data

Time saved manually entering data (this advantage needs to be considered in light of the extra time you will spend designing, developing and maintaining your online study)

Copyright issues regarding placing questionnaires on the internet

Demand characteristics and experimenter effects less likely to occur