Dilution model research: five goals on one habit, less belief in it
The dilution model (Zhang, Fishbach, Kruglanski, 2007) says loading many goals onto one habit weakens it. Why you stop starting, and a one-goal fix.
In this article3 sections
Does piling goals onto one habit make you quit it? It can. The more goals a single habit has to serve, the less you believe it works for any one of them.
That is the dilution model. Ying Zhang, Ayelet Fishbach and Arie Kruglanski tested it in six experiments, published in the Journal of Personality and Social Psychology in 2007. I read the abstract on PubMed, not the full paper.
What did the researchers find?
Their example: exercise can build muscle and also help you lose weight. When both goals are on your mind, the link between exercise and each goal weakens, so exercise looks less effective for either one. The abstract says such multi-goal means are “less likely to be chosen and pursued” when only one of the goals is active.
The more goals shared the route, the less each one seemed to need it.
Why does this keep people from finishing things?
Think of “I’ll wake at 5 a.m. and finally get fit, write the book, save money and feel calm.” One habit, four promises, none of them believed. The paper does not say this explains every abandoned goal. It does give a concrete reason a sweeping resolution can feel flimsy before day one.
What can you do about it?
Give each habit one job. Write the single goal next to it, and drop the rest from that habit’s reason. The other goals still need routes of their own, and the goal-conflict audit helps you choose. If the habit is an early alarm, this piece on what the 5 a.m. advice gets wrong picks up from there.