The Critical Chain Implementation Handbook

It is possible that a single assumption is so powerful that it can lead to a tactic without an additional assumption.

of assumptions: Necessary, Parallel, and Sufficiency.

The Necessary Assumption exists at the top of every S&T entity with the exception of the very top entity—the overall company strategy.

2) Were the expected effects realized?

Assumptions should be scrutinized, tested and challenged.

Even the assumptions in the S&T trees need to be challenged and tested. Some customization might be required for a particular environment. This could mean different assumptions and different tactics.

Parallel Assumptions are statements about how we perceive reality. There are usually, but not always at least two Parallel Assumptions in an S&T entity.

But is important first to stress that assumptions are just that—assumptions. Assumptions are not facts. Assumptions can be either valid or invalid.

Parallel Assumption: One might be able to think of many different tactics to achieve a particular strategy. But are all tactics created equal? Does it not stand to reason that some tactics will be more effective than others? If so, how do we know we have chosen the best, most effective tactics to secure our strategy? The parallel assumptions lead u