This informative, emotional and clearly worthy HBO venture – about the illness that affects cognitive skills – is composed of four separate but related programs.

"The Memory Loss Tapes" profiles seven Alzheimer's patients at various stages of the disease.

"Momentum in Science" examines advances in research into Alzheimer's.

"Grandpa, Do You Know Who I Am?" featuring Maria Shriver (one of the project's executive producers) probes the impact on a patient's descendants.

"Caregivers" highlights those who deal with their affected loved ones. **** (Not rated: AS, P)

Buy 'The Alzheimer's Project' on DVD.