Accrued, Allocated and Attribued, what is the difference?

[truth in lending]

I am reading the book on Pension Funding and Valuation by Wiliam Aitken...

When I am browsing through it, the words allocated, accrued and attributed are used. But I thought in the first place that they are synonymous to one another. But later, I was wrong.

May I request for help regarding the concepts behind these three words?